642379941880 has 16 divisors (see below), whose sum is σ = 1445354869320. Its totient is φ = 256951976736.

The previous prime is 642379941877. The next prime is 642379941881. The reversal of 642379941880 is 88149973246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642379941881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8029749234 + ... + 8029749313.

Almost surely, 2^642379941880 is an apocalyptic number.

It is an amenable number.

642379941880 is an abundant number, since it is smaller than the sum of its proper divisors (802974927440).

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

642379941880 is a wasteful number, since it uses less digits than its factorization.

642379941880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16059498558 (or 16059498554 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 61.

The spelling of 642379941880 in words is "six hundred forty-two billion, three hundred seventy-nine million, nine hundred forty-one thousand, eight hundred eighty".