687164540931 has 42 divisors (see below), whose sum is σ = 1124058342612. Its totient is φ = 416418369120.

The previous prime is 687164540929. The next prime is 687164540947. The reversal of 687164540931 is 139045461786.

687164540931 is a `hidden beast` number, since 6 + 8 + 7 + 1 + 6 + 4 + 540 + 93 + 1 = 666.

It is not a de Polignac number, because 687164540931 - 2¹ = 687164540929 is a prime.

It is a super-2 number, since 2×687164540931² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (687164540981) by changing a digit.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 74227255 + ... + 74236511.

Almost surely, 2^687164540931 is an apocalyptic number.

687164540931 is a deficient number, since it is larger than the sum of its proper divisors (436893801681).

687164540931 is an frugal number, since it uses more digits than its factorization.

687164540931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18543 (or 9271 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 687164540931 in words is "six hundred eighty-seven billion, one hundred sixty-four million, five hundred forty thousand, nine hundred thirty-one".