18511434368 has 64 divisors (see below), whose sum is σ = 44625816000. Its totient is φ = 7466790912.

The previous prime is 18511434343. The next prime is 18511434377. The reversal of 18511434368 is 86343411581.

It is a tau number, because it is divible by the number of its divisors (64).

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, 592418 + ... + 622881.

It is an arithmetic number, because the mean of its divisors is an integer number (697278375).

Almost surely, 2^18511434368 is an apocalyptic number.

It is an amenable number.

18511434368 is an abundant number, since it is smaller than the sum of its proper divisors (26114381632).

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

18511434368 is a wasteful number, since it uses less digits than its factorization.

18511434368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215337 (or 1215325 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The spelling of 18511434368 in words is "eighteen billion, five hundred eleven million, four hundred thirty-four thousand, three hundred sixty-eight".