640700506375 has 16 divisors (see below), whose sum is σ = 811528484832. Its totient is φ = 504910243200.

The previous prime is 640700506291. The next prime is 640700506427. The reversal of 640700506375 is 573605007046.

It is not a de Polignac number, because 640700506375 - 2¹⁵ = 640700473607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38242402 + ... + 38259151.

It is an arithmetic number, because the mean of its divisors is an integer number (50720530302).

Almost surely, 2^640700506375 is an apocalyptic number.

640700506375 is a deficient number, since it is larger than the sum of its proper divisors (170827978457).

640700506375 is an equidigital number, since it uses as much as digits as its factorization.

640700506375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76501635 (or 76501625 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 43.

The spelling of 640700506375 in words is "six hundred forty billion, seven hundred million, five hundred six thousand, three hundred seventy-five".