640564125443620 has 24 divisors (see below), whose sum is σ = 1537353901065024. Its totient is φ = 219621985866336.

The previous prime is 640564125443611. The next prime is 640564125443657. The reversal of 640564125443620 is 26344521465046.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2287729019302 + ... + 2287729019581.

It is an arithmetic number, because the mean of its divisors is an integer number (64056412544376).

Almost surely, 2^{640564125443620} is an apocalyptic number.

It is an amenable number.

640564125443620 is an abundant number, since it is smaller than the sum of its proper divisors (896789775621404).

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

640564125443620 is a wasteful number, since it uses less digits than its factorization.

640564125443620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4575458038899 (or 4575458038897 counting only the distinct ones).

The product of its (nonzero) digits is 16588800, while the sum is 52.

The spelling of 640564125443620 in words is "six hundred forty trillion, five hundred sixty-four billion, one hundred twenty-five million, four hundred forty-three thousand, six hundred twenty".