172666917277 has 2 divisors, whose sum is σ = 172666917278. Its totient is φ = 172666917276.

The previous prime is 172666917271. The next prime is 172666917287. The reversal of 172666917277 is 772719666271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95744449476 + 76922467801 = 309426^2 + 277349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172666917277 is a prime.

It is a super-2 number, since 2×172666917277² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172666917271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86333458638 + 86333458639.

It is an arithmetic number, because the mean of its divisors is an integer number (86333458639).

Almost surely, 2^172666917277 is an apocalyptic number.

It is an amenable number.

172666917277 is a deficient number, since it is larger than the sum of its proper divisors (1).

172666917277 is an equidigital number, since it uses as much as digits as its factorization.

172666917277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18670176, while the sum is 61.

The spelling of 172666917277 in words is "one hundred seventy-two billion, six hundred sixty-six million, nine hundred seventeen thousand, two hundred seventy-seven".