18644017836912 has 160 divisors (see below), whose sum is σ = 52197715132416. Its totient is φ = 5700288921600.

The previous prime is 18644017836907. The next prime is 18644017836929. The reversal of 18644017836912 is 21963871044681.

It is a super-2 number, since 2×18644017836912² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108490768 + ... + 108662480.

Almost surely, 2^{18644017836912} is an apocalyptic number.

18644017836912 is a gapful number since it is divisible by the number (12) 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 18644017836912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26098857566208).

18644017836912 is an abundant number, since it is smaller than the sum of its proper divisors (33553697295504).

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

18644017836912 is a wasteful number, since it uses less digits than its factorization.

18644017836912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172839 (or 172833 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 60.

The spelling of 18644017836912 in words is "eighteen trillion, six hundred forty-four billion, seventeen million, eight hundred thirty-six thousand, nine hundred twelve".