640256553604 has 48 divisors (see below), whose sum is σ = 1194738914880. Its totient is φ = 299175690240.

The previous prime is 640256553589. The next prime is 640256553617. The reversal of 640256553604 is 406355652046.

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, 5795524 + ... + 5904964.

It is an arithmetic number, because the mean of its divisors is an integer number (24890394060).

Almost surely, 2^640256553604 is an apocalyptic number.

It is an amenable number.

640256553604 is a deficient number, since it is larger than the sum of its proper divisors (554482361276).

640256553604 is a wasteful number, since it uses less digits than its factorization.

640256553604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110068 (or 110066 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 46.

The spelling of 640256553604 in words is "six hundred forty billion, two hundred fifty-six million, five hundred fifty-three thousand, six hundred four".