81537746120124 has 96 divisors (see below), whose sum is σ = 220455980000256. Its totient is φ = 22974591237120.

The previous prime is 81537746119997. The next prime is 81537746120141. The reversal of 81537746120124 is 42102164773518.

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, 17467047 + ... + 21637310.

It is an arithmetic number, because the mean of its divisors is an integer number (2296416458336).

Almost surely, 2^{81537746120124} is an apocalyptic number.

81537746120124 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

81537746120124 is an abundant number, since it is smaller than the sum of its proper divisors (138918233880132).

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

81537746120124 is a wasteful number, since it uses less digits than its factorization.

81537746120124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39104715 (or 39104713 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 51.

The spelling of 81537746120124 in words is "eighty-one trillion, five hundred thirty-seven billion, seven hundred forty-six million, one hundred twenty thousand, one hundred twenty-four".