18637231140864 has 1456 divisors, whose sum is σ = 67382075443200. Its totient is φ = 5144372674560.

The previous prime is 18637231140863. The next prime is 18637231140887. The reversal of 18637231140864 is 46804113273681.

18637231140864 is a `hidden beast` number, since 1 + 86 + 3 + 72 + 31 + 1 + 408 + 64 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18637231140864.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18637231140863) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 31749967579 + ... + 31749968165.

Almost surely, 2^{18637231140864} is an apocalyptic number.

18637231140864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18637231140864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33691037721600).

18637231140864 is an abundant number, since it is smaller than the sum of its proper divisors (48744844302336).

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

18637231140864 is an frugal number, since it uses more digits than its factorization.

18637231140864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 54.

The spelling of 18637231140864 in words is "eighteen trillion, six hundred thirty-seven billion, two hundred thirty-one million, one hundred forty thousand, eight hundred sixty-four".