642919513518 has 32 divisors (see below), whose sum is σ = 1436968490400. Its totient is φ = 213067735488.

The previous prime is 642919513447. The next prime is 642919513541. The reversal of 642919513518 is 815315919246.

642919513518 is a `hidden beast` number, since 6 + 4 + 29 + 1 + 95 + 13 + 518 = 666.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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, 34400823 + ... + 34419506.

It is an arithmetic number, because the mean of its divisors is an integer number (44905265325).

Almost surely, 2^642919513518 is an apocalyptic number.

642919513518 is an abundant number, since it is smaller than the sum of its proper divisors (794048976882).

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

642919513518 is a wasteful number, since it uses less digits than its factorization.

642919513518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68820513 (or 68820507 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 54.

The spelling of 642919513518 in words is "six hundred forty-two billion, nine hundred nineteen million, five hundred thirteen thousand, five hundred eighteen".