81886267044 has 72 divisors (see below), whose sum is σ = 208009273472. Its totient is φ = 27161386560.

The previous prime is 81886267033. The next prime is 81886267069. The reversal of 81886267044 is 44076268818.

81886267044 is a `hidden beast` number, since 8 + 1 + 8 + 8 + 626 + 7 + 0 + 4 + 4 = 666.

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, 6210579 + ... + 6223749.

Almost surely, 2^81886267044 is an apocalyptic number.

It is an amenable number.

81886267044 is an abundant number, since it is smaller than the sum of its proper divisors (126123006428).

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

81886267044 is a wasteful number, since it uses less digits than its factorization.

81886267044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14017 (or 14012 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 54.

The spelling of 81886267044 in words is "eighty-one billion, eight hundred eighty-six million, two hundred sixty-seven thousand, forty-four".