6404625658 has 16 divisors (see below), whose sum is σ = 9672461064. Its totient is φ = 3180490560.

The previous prime is 6404625653. The next prime is 6404625673. The reversal of 6404625658 is 8565264046.

It can be written as a sum of positive squares in 4 ways, for example, as 4931831529 + 1472794129 = 70227^2 + 38377^2 .

It is a super-2 number, since 2×6404625658² = 82038459638223865928, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 1214748 + ... + 1220008.

Almost surely, 2^6404625658 is an apocalyptic number.

6404625658 is a deficient number, since it is larger than the sum of its proper divisors (3267835406).

6404625658 is a wasteful number, since it uses less digits than its factorization.

6404625658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9297.

The product of its (nonzero) digits is 1382400, while the sum is 46.

The square root of 6404625658 is about 80028.9051405803. The cubic root of 6404625658 is about 1857.0827257775.

The spelling of 6404625658 in words is "six billion, four hundred four million, six hundred twenty-five thousand, six hundred fifty-eight".