6642653931 has 12 divisors (see below), whose sum is σ = 9603503208. Its totient is φ = 4424485824.

The previous prime is 6642653923. The next prime is 6642653939. The reversal of 6642653931 is 1393562466.

6642653931 is a `hidden beast` number, since 6 + 64 + 26 + 539 + 31 = 666.

It is an interprime number because it is at equal distance from previous prime (6642653923) and next prime (6642653939).

It is not a de Polignac number, because 6642653931 - 2³ = 6642653923 is a prime.

It is a super-2 number, since 2×6642653931² = 88249702494059505522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6642653939) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 318510 + ... + 338723.

It is an arithmetic number, because the mean of its divisors is an integer number (800291934).

Almost surely, 2^6642653931 is an apocalyptic number.

6642653931 is a deficient number, since it is larger than the sum of its proper divisors (2960849277).

6642653931 is a wasteful number, since it uses less digits than its factorization.

6642653931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658362 (or 658359 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 6642653931 is about 81502.4780666208. The cubic root of 6642653931 is about 1879.8096543177.

The spelling of 6642653931 in words is "six billion, six hundred forty-two million, six hundred fifty-three thousand, nine hundred thirty-one".