640616125550 has 24 divisors (see below), whose sum is σ = 1220608094832. Its totient is φ = 249996536000.

The previous prime is 640616125511. The next prime is 640616125613. The reversal of 640616125550 is 55521616046.

640616125550 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a junction number, because it is equal to n+sod(n) for n = 640616125498 and 640616125507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156245786 + ... + 156249885.

It is an arithmetic number, because the mean of its divisors is an integer number (50858670618).

Almost surely, 2^640616125550 is an apocalyptic number.

640616125550 is a deficient number, since it is larger than the sum of its proper divisors (579991969282).

640616125550 is a wasteful number, since it uses less digits than its factorization.

640616125550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312495724 (or 312495719 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 640616125550 in words is "six hundred forty billion, six hundred sixteen million, one hundred twenty-five thousand, five hundred fifty".