172666917287 has 2 divisors, whose sum is σ = 172666917288. Its totient is φ = 172666917286.

The previous prime is 172666917277. The next prime is 172666917349. The reversal of 172666917287 is 782719666271.

It is an a-pointer prime, because the next prime (172666917349) can be obtained adding 172666917287 to its sum of digits (62).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172666917287 - 2⁴ = 172666917271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172666917277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86333458643 + 86333458644.

It is an arithmetic number, because the mean of its divisors is an integer number (86333458644).

Almost surely, 2^172666917287 is an apocalyptic number.

172666917287 is a deficient number, since it is larger than the sum of its proper divisors (1).

172666917287 is an equidigital number, since it uses as much as digits as its factorization.

172666917287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21337344, while the sum is 62.

The spelling of 172666917287 in words is "one hundred seventy-two billion, six hundred sixty-six million, nine hundred seventeen thousand, two hundred eighty-seven".