81047875182 has 32 divisors (see below), whose sum is σ = 162741519360. Its totient is φ = 26908511520.

The previous prime is 81047875099. The next prime is 81047875213. The reversal of 81047875182 is 28157874018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1815307 + ... + 1859417.

It is an arithmetic number, because the mean of its divisors is an integer number (5085672480).

Almost surely, 2^81047875182 is an apocalyptic number.

81047875182 is an abundant number, since it is smaller than the sum of its proper divisors (81693644178).

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

81047875182 is a wasteful number, since it uses less digits than its factorization.

81047875182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45328.

The product of its (nonzero) digits is 1003520, while the sum is 51.

The spelling of 81047875182 in words is "eighty-one billion, forty-seven million, eight hundred seventy-five thousand, one hundred eighty-two".