640505602411564 has 48 divisors (see below), whose sum is σ = 1238550139814400. Its totient is φ = 288468437913216.

The previous prime is 640505602411529. The next prime is 640505602411657. The reversal of 640505602411564 is 465114206505046.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1096779849 + ... + 1097363680.

It is an arithmetic number, because the mean of its divisors is an integer number (25803127912800).

Almost surely, 2^{640505602411564} is an apocalyptic number.

It is an amenable number.

640505602411564 is a deficient number, since it is larger than the sum of its proper divisors (598044537402836).

640505602411564 is a wasteful number, since it uses less digits than its factorization.

640505602411564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2194143742 (or 2194143740 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 49.

The spelling of 640505602411564 in words is "six hundred forty trillion, five hundred five billion, six hundred two million, four hundred eleven thousand, five hundred sixty-four".