640104651520 has 36 divisors (see below), whose sum is σ = 1533250676160. Its totient is φ = 256041860096.

The previous prime is 640104651503. The next prime is 640104651559. The reversal of 640104651520 is 25156401046.

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, 250039600 + ... + 250042159.

It is an arithmetic number, because the mean of its divisors is an integer number (42590296560).

Almost surely, 2^640104651520 is an apocalyptic number.

It is an amenable number.

640104651520 is an abundant number, since it is smaller than the sum of its proper divisors (893146024640).

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

640104651520 is an equidigital number, since it uses as much as digits as its factorization.

640104651520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500081780 (or 500081766 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The spelling of 640104651520 in words is "six hundred forty billion, one hundred four million, six hundred fifty-one thousand, five hundred twenty".