172641577103509 has 2 divisors, whose sum is σ = 172641577103510. Its totient is φ = 172641577103508.

The previous prime is 172641577103503. The next prime is 172641577103521. The reversal of 172641577103509 is 905301775146271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169213839601284 + 3427737502225 = 13008222^2 + 1851415^2 .

It is an emirp because it is prime and its reverse (905301775146271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172641577103509 - 2⁵ = 172641577103477 is a prime.

It is a super-2 number, since 2×172641577103509² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172641577103503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86320788551754 + 86320788551755.

It is an arithmetic number, because the mean of its divisors is an integer number (86320788551755).

Almost surely, 2^{172641577103509} is an apocalyptic number.

It is an amenable number.

172641577103509 is a deficient number, since it is larger than the sum of its proper divisors (1).

172641577103509 is an equidigital number, since it uses as much as digits as its factorization.

172641577103509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11113200, while the sum is 58.

The spelling of 172641577103509 in words is "one hundred seventy-two trillion, six hundred forty-one billion, five hundred seventy-seven million, one hundred three thousand, five hundred nine".