68172405631 has 24 divisors (see below), whose sum is σ = 78936021360. Its totient is φ = 58669269120.

The previous prime is 68172405611. The next prime is 68172405647. The reversal of 68172405631 is 13650427186.

It is not a de Polignac number, because 68172405631 - 2⁷ = 68172405503 is a prime.

It is a super-2 number, since 2×68172405631² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68172405611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3284121 + ... + 3304813.

It is an arithmetic number, because the mean of its divisors is an integer number (3289000890).

Almost surely, 2^68172405631 is an apocalyptic number.

68172405631 is a deficient number, since it is larger than the sum of its proper divisors (10763615729).

68172405631 is a wasteful number, since it uses less digits than its factorization.

68172405631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22167 (or 22156 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 68172405631 in words is "sixty-eight billion, one hundred seventy-two million, four hundred five thousand, six hundred thirty-one".