18844500121920 has 224 divisors, whose sum is σ = 72522773562240. Its totient is φ = 4568363642880.

The previous prime is 18844500121877. The next prime is 18844500121943. The reversal of 18844500121920 is 2912100544881.

18844500121920 is a `hidden beast` number, since 1 + 8 + 8 + 4 + 450 + 0 + 1 + 2 + 192 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99044797 + ... + 99234876.

Almost surely, 2^{18844500121920} is an apocalyptic number.

18844500121920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18844500121920 is an abundant number, since it is smaller than the sum of its proper divisors (53678273440320).

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

18844500121920 is a wasteful number, since it uses less digits than its factorization.

18844500121920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198279710 (or 198279694 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 18844500121920 in words is "eighteen trillion, eight hundred forty-four billion, five hundred million, one hundred twenty-one thousand, nine hundred twenty".