642808792386 has 48 divisors (see below), whose sum is σ = 1408975551360. Its totient is φ = 211781718720.

The previous prime is 642808792309. The next prime is 642808792429. The reversal of 642808792386 is 683297808246.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 633195 + ... + 1298673.

It is an arithmetic number, because the mean of its divisors is an integer number (29353657320).

Almost surely, 2^642808792386 is an apocalyptic number.

642808792386 is an abundant number, since it is smaller than the sum of its proper divisors (766166758974).

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

642808792386 is a wasteful number, since it uses less digits than its factorization.

642808792386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666111 (or 666108 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 63.

The spelling of 642808792386 in words is "six hundred forty-two billion, eight hundred eight million, seven hundred ninety-two thousand, three hundred eighty-six".