640516670000 has 50 divisors (see below), whose sum is σ = 1550754933948. Its totient is φ = 256206664000.

The previous prime is 640516669997. The next prime is 640516670023. The reversal of 640516670000 is 76615046.

It is a tau number, because it is divible by the number of its divisors (50).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 32015834 + ... + 32035833.

Almost surely, 2^640516670000 is an apocalyptic number.

It is an amenable number.

640516670000 is an abundant number, since it is smaller than the sum of its proper divisors (910238263948).

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

640516670000 is an equidigital number, since it uses as much as digits as its factorization.

640516670000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64051695 (or 64051674 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 640516670000 in words is "six hundred forty billion, five hundred sixteen million, six hundred seventy thousand".