640033670064 has 20 divisors (see below), whose sum is σ = 1653420314456. Its totient is φ = 213344556672.

The previous prime is 640033670047. The next prime is 640033670083. The reversal of 640033670064 is 460076330046.

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, 6667017349 + ... + 6667017444.

Almost surely, 2^640033670064 is an apocalyptic number.

It is an amenable number.

640033670064 is an abundant number, since it is smaller than the sum of its proper divisors (1013386644392).

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

640033670064 is a wasteful number, since it uses less digits than its factorization.

640033670064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13334034804 (or 13334034798 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 39.

The spelling of 640033670064 in words is "six hundred forty billion, thirty-three million, six hundred seventy thousand, sixty-four".