18939151236 has 12 divisors (see below), whose sum is σ = 44191352912. Its totient is φ = 6313050408.

The previous prime is 18939151219. The next prime is 18939151237. The reversal of 18939151236 is 63215193981.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (18939151237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 789131290 + ... + 789131313.

Almost surely, 2^18939151236 is an apocalyptic number.

It is an amenable number.

18939151236 is an abundant number, since it is smaller than the sum of its proper divisors (25252201676).

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

18939151236 is a wasteful number, since it uses less digits than its factorization.

18939151236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578262610 (or 1578262608 counting only the distinct ones).

The product of its digits is 349920, while the sum is 48.

The spelling of 18939151236 in words is "eighteen billion, nine hundred thirty-nine million, one hundred fifty-one thousand, two hundred thirty-six".