@Kewpie said546 is the exact number of times i have been sent scurrying for wiki
542 is a nontotient, its factors are 2 and 271.
amazing what i can learn without understanding it
Nontotient
In number theory, a nontotient is a positive integer n which is not a totient number: it is not in the range of Euler's totient function φ, that is, the equation φ = n has no solution x. In other words, n is a nontotient if there is no integer x that has exactly n coprimes below it. All odd numbers are nontotients, except 1, since it has the solutions x = 1 and x = 2. Wikipedia
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Er, for a moment I thought we were playing Mornington Crescent. But I do wonder what the buses of that line might get up to at night and on Sundays.
At first I thought 550 would just be a transitional number, but as it turns out that was the year in the Common Era when Hindu mathematicians gave zero a numerical representation in a positional notation system, without which numbers such at 550 itself would not be.
(and I'll not camp out for it, but the best of luck to whomever gets 555, coming up soon -- as for me, earlier today or perhaps yesterday I have already bought a couple of cans of 555 brand mackerel, which I guess was not very lucky for those poor fishies)