6400644620264 has 32 divisors (see below), whose sum is σ = 12016963008000. Its totient is φ = 3196122264192.

The previous prime is 6400644620203. The next prime is 6400644620267. The reversal of 6400644620264 is 4620264460046.

It is not an unprimeable number, because it can be changed into a prime (6400644620267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48746252 + ... + 48877380.

It is an arithmetic number, because the mean of its divisors is an integer number (375530094000).

Almost surely, 2^{6400644620264} is an apocalyptic number.

It is an amenable number.

6400644620264 is a deficient number, since it is larger than the sum of its proper divisors (5616318387736).

6400644620264 is a wasteful number, since it uses less digits than its factorization.

6400644620264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139097 (or 139093 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 44.

The spelling of 6400644620264 in words is "six trillion, four hundred billion, six hundred forty-four million, six hundred twenty thousand, two hundred sixty-four".