81077440044 has 12 divisors (see below), whose sum is σ = 189180693464. Its totient is φ = 27025813344.

The previous prime is 81077440019. The next prime is 81077440063. The reversal of 81077440044 is 44004477018.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 81077439984 and 81077440011.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3378226657 + ... + 3378226680.

Almost surely, 2^81077440044 is an apocalyptic number.

It is an amenable number.

81077440044 is an abundant number, since it is smaller than the sum of its proper divisors (108103253420).

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

81077440044 is a wasteful number, since it uses less digits than its factorization.

81077440044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6756453344 (or 6756453342 counting only the distinct ones).

The product of its (nonzero) digits is 100352, while the sum is 39.

The spelling of 81077440044 in words is "eighty-one billion, seventy-seven million, four hundred forty thousand, forty-four".