172659438857 has 2 divisors, whose sum is σ = 172659438858. Its totient is φ = 172659438856.

The previous prime is 172659438851. The next prime is 172659438869. The reversal of 172659438857 is 758834956271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87495273616 + 85164165241 = 295796^2 + 291829^2 .

It is a cyclic number.

It is not a de Polignac number, because 172659438857 - 2²⁶ = 172592329993 is a prime.

It is a super-2 number, since 2×172659438857² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 172659438793 and 172659438802.

It is not a weakly prime, because it can be changed into another prime (172659438851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86329719428 + 86329719429.

It is an arithmetic number, because the mean of its divisors is an integer number (86329719429).

Almost surely, 2^172659438857 is an apocalyptic number.

It is an amenable number.

172659438857 is a deficient number, since it is larger than the sum of its proper divisors (1).

172659438857 is an equidigital number, since it uses as much as digits as its factorization.

172659438857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 101606400, while the sum is 65.

The spelling of 172659438857 in words is "one hundred seventy-two billion, six hundred fifty-nine million, four hundred thirty-eight thousand, eight hundred fifty-seven".