6657404864 has 56 divisors (see below), whose sum is σ = 14718475008. Its totient is φ = 2961693440.

The previous prime is 6657404827. The next prime is 6657404869. The reversal of 6657404864 is 4684047566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6657404869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67514 + ... + 133689.

Almost surely, 2^6657404864 is an apocalyptic number.

6657404864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6657404864 is an abundant number, since it is smaller than the sum of its proper divisors (8061070144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6657404864 is a wasteful number, since it uses less digits than its factorization.

6657404864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201273 (or 201263 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 50.

The square root of 6657404864 is about 81592.9216537807. The cubic root of 6657404864 is about 1881.2000848351.

The spelling of 6657404864 in words is "six billion, six hundred fifty-seven million, four hundred four thousand, eight hundred sixty-four".