81400077054 has 24 divisors (see below), whose sum is σ = 177713150472. Its totient is φ = 26926233360.

The previous prime is 81400077043. The next prime is 81400077079. The reversal of 81400077054 is 45077000418.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 17258049 + ... + 17262764.

It is an arithmetic number, because the mean of its divisors is an integer number (7404714603).

Almost surely, 2^81400077054 is an apocalyptic number.

81400077054 is an abundant number, since it is smaller than the sum of its proper divisors (96313073418).

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

81400077054 is a wasteful number, since it uses less digits than its factorization.

81400077054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34520952 (or 34520949 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The spelling of 81400077054 in words is "eighty-one billion, four hundred million, seventy-seven thousand, fifty-four".