18973561979152 has 40 divisors (see below), whose sum is σ = 40668044524992. Its totient is φ = 8502876681600.

The previous prime is 18973561979147. The next prime is 18973561979167. The reversal of 18973561979152 is 25197916537981.

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, 759172923 + ... + 759197914.

Almost surely, 2^{18973561979152} is an apocalyptic number.

It is an amenable number.

18973561979152 is an abundant number, since it is smaller than the sum of its proper divisors (21694482545840).

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

18973561979152 is a wasteful number, since it uses less digits than its factorization.

18973561979152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518370927 (or 1518370921 counting only the distinct ones).

The product of its digits is 257191200, while the sum is 73.

The spelling of 18973561979152 in words is "eighteen trillion, nine hundred seventy-three billion, five hundred sixty-one million, nine hundred seventy-nine thousand, one hundred fifty-two".