640620135316 has 24 divisors (see below), whose sum is σ = 1298791511360. Its totient is φ = 270790506432.

The previous prime is 640620135301. The next prime is 640620135347. The reversal of 640620135316 is 613531026046.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156705426 + ... + 156709513.

Almost surely, 2^640620135316 is an apocalyptic number.

It is an amenable number.

640620135316 is an abundant number, since it is smaller than the sum of its proper divisors (658171376044).

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

640620135316 is a wasteful number, since it uses less digits than its factorization.

640620135316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313415023 (or 313415021 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The spelling of 640620135316 in words is "six hundred forty billion, six hundred twenty million, one hundred thirty-five thousand, three hundred sixteen".