6404625657 has 12 divisors (see below), whose sum is σ = 9447959040. Its totient is φ = 4178904408.

The previous prime is 6404625653. The next prime is 6404625673. The reversal of 6404625657 is 7565264046.

6404625657 is a `hidden beast` number, since 6 + 40 + 46 + 2 + 565 + 7 = 666.

It is not a de Polignac number, because 6404625657 - 2² = 6404625653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6404625653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7570057 + ... + 7570902.

It is an arithmetic number, because the mean of its divisors is an integer number (787329920).

Almost surely, 2^6404625657 is an apocalyptic number.

It is an amenable number.

6404625657 is a deficient number, since it is larger than the sum of its proper divisors (3043333383).

6404625657 is a wasteful number, since it uses less digits than its factorization.

6404625657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15141012 (or 15141009 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 45.

The square root of 6404625657 is about 80028.9051343326. The cubic root of 6404625657 is about 1857.0827256808.

The spelling of 6404625657 in words is "six billion, four hundred four million, six hundred twenty-five thousand, six hundred fifty-seven".