18857144736 has 120 divisors (see below), whose sum is σ = 58720731300. Its totient is φ = 5915953152.

The previous prime is 18857144729. The next prime is 18857144749. The reversal of 18857144736 is 63744175881.

It can be written as a sum of positive squares in 2 ways, for example, as 18273632400 + 583512336 = 135180^2 + 24156^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 169911 + ... + 258038.

Almost surely, 2^18857144736 is an apocalyptic number.

18857144736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18857144736 is an abundant number, since it is smaller than the sum of its proper divisors (39863586564).

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

18857144736 is a wasteful number, since it uses less digits than its factorization.

18857144736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427988 (or 427971 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 54.

The spelling of 18857144736 in words is "eighteen billion, eight hundred fifty-seven million, one hundred forty-four thousand, seven hundred thirty-six".