664676912540 has 12 divisors (see below), whose sum is σ = 1395821516376. Its totient is φ = 265870765008.

The previous prime is 664676912477. The next prime is 664676912563. The reversal of 664676912540 is 45219676466.

664676912540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16616922794 + ... + 16616922833.

It is an arithmetic number, because the mean of its divisors is an integer number (116318459698).

Almost surely, 2^664676912540 is an apocalyptic number.

It is an amenable number.

664676912540 is an abundant number, since it is smaller than the sum of its proper divisors (731144603836).

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

664676912540 is a wasteful number, since it uses less digits than its factorization.

664676912540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33233845636 (or 33233845634 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 56.

The spelling of 664676912540 in words is "six hundred sixty-four billion, six hundred seventy-six million, nine hundred twelve thousand, five hundred forty".