642902916651408 has 240 divisors, whose sum is σ = 2164518530836480. Its totient is φ = 174016824512256.

The previous prime is 642902916651377. The next prime is 642902916651451. The reversal of 642902916651408 is 804156619209246.

642902916651408 is a `hidden beast` number, since 6 + 4 + 2 + 90 + 2 + 91 + 6 + 6 + 51 + 408 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2498881785 + ... + 2499139047.

Almost surely, 2^{642902916651408} is an apocalyptic number.

It is an amenable number.

642902916651408 is an abundant number, since it is smaller than the sum of its proper divisors (1521615614185072).

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

642902916651408 is a wasteful number, since it uses less digits than its factorization.

642902916651408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387786 (or 387777 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 63.

The spelling of 642902916651408 in words is "six hundred forty-two trillion, nine hundred two billion, nine hundred sixteen million, six hundred fifty-one thousand, four hundred eight".