640377518454 has 24 divisors (see below), whose sum is σ = 1387499661912. Its totient is φ = 213456859200.

The previous prime is 640377518437. The next prime is 640377518467. The reversal of 640377518454 is 454815773046.

640377518454 is a `hidden beast` number, since 6 + 4 + 0 + 3 + 77 + 518 + 4 + 54 = 666.

It is a super-2 number, since 2×640377518454² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 640377518454.

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, 2634942 + ... + 2867694.

It is an arithmetic number, because the mean of its divisors is an integer number (57812485913).

Almost surely, 2^640377518454 is an apocalyptic number.

640377518454 is an abundant number, since it is smaller than the sum of its proper divisors (747122143458).

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

640377518454 is a wasteful number, since it uses less digits than its factorization.

640377518454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385612 (or 385609 counting only the distinct ones).

The product of its (nonzero) digits is 11289600, while the sum is 54.

The spelling of 640377518454 in words is "six hundred forty billion, three hundred seventy-seven million, five hundred eighteen thousand, four hundred fifty-four".