18644021496 has 48 divisors (see below), whose sum is σ = 50503691160. Its totient is φ = 6213508800.

The previous prime is 18644021477. The next prime is 18644021503. The reversal of 18644021496 is 69412044681.

18644021496 is a `hidden beast` number, since 186 + 440 + 21 + 4 + 9 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 418051 + ... + 460493.

Almost surely, 2^18644021496 is an apocalyptic number.

It is an amenable number.

18644021496 is an abundant number, since it is smaller than the sum of its proper divisors (31859669664).

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

18644021496 is a wasteful number, since it uses less digits than its factorization.

18644021496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48556 (or 48549 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

It can be divided in two parts, 186440 and 21496, that added together give a square (207936 = 456²).

The spelling of 18644021496 in words is "eighteen billion, six hundred forty-four million, twenty-one thousand, four hundred ninety-six".