642630642544 has 40 divisors (see below), whose sum is σ = 1368656150400. Its totient is φ = 289875019200.

The previous prime is 642630642527. The next prime is 642630642593. The reversal of 642630642544 is 445246036246.

It is a junction number, because it is equal to n+sod(n) for n = 642630642494 and 642630642503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13913244 + ... + 13959355.

It is an arithmetic number, because the mean of its divisors is an integer number (34216403760).

Almost surely, 2^642630642544 is an apocalyptic number.

It is an amenable number.

642630642544 is an abundant number, since it is smaller than the sum of its proper divisors (726025507856).

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

642630642544 is a wasteful number, since it uses less digits than its factorization.

642630642544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27872749 (or 27872743 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 46.

The spelling of 642630642544 in words is "six hundred forty-two billion, six hundred thirty million, six hundred forty-two thousand, five hundred forty-four".