18400081820940 has 72 divisors (see below), whose sum is σ = 55815188629200. Its totient is φ = 4906547201664.

The previous prime is 18400081820881. The next prime is 18400081820969. The reversal of 18400081820940 is 4902818000481.

18400081820940 is a `hidden beast` number, since 1 + 8 + 400 + 0 + 81 + 82 + 0 + 94 + 0 = 666.

It is a super-2 number, since 2×18400081820940² (a number of 27 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4872687 + ... + 7780953.

Almost surely, 2^{18400081820940} is an apocalyptic number.

18400081820940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18400081820940 is an abundant number, since it is smaller than the sum of its proper divisors (37415106808260).

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

18400081820940 is a wasteful number, since it uses less digits than its factorization.

18400081820940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2943431 (or 2943426 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The spelling of 18400081820940 in words is "eighteen trillion, four hundred billion, eighty-one million, eight hundred twenty thousand, nine hundred forty".