81949588130844 has 96 divisors (see below), whose sum is σ = 243376968038400. Its totient is φ = 23359842728640.

The previous prime is 81949588130831. The next prime is 81949588130881. The reversal of 81949588130844 is 44803188594918.

81949588130844 is a `hidden beast` number, since 8 + 1 + 9 + 4 + 9 + 588 + 1 + 30 + 8 + 4 + 4 = 666.

81949588130844 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125426979 + ... + 126078650.

It is an arithmetic number, because the mean of its divisors is an integer number (2535176750400).

Almost surely, 2^{81949588130844} is an apocalyptic number.

81949588130844 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

81949588130844 is an abundant number, since it is smaller than the sum of its proper divisors (161427379907556).

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

81949588130844 is a wasteful number, since it uses less digits than its factorization.

81949588130844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251506080 (or 251506072 counting only the distinct ones).

The product of its (nonzero) digits is 318504960, while the sum is 72.

The spelling of 81949588130844 in words is "eighty-one trillion, nine hundred forty-nine billion, five hundred eighty-eight million, one hundred thirty thousand, eight hundred forty-four".