81880075558838 has 16 divisors (see below), whose sum is σ = 123084746546256. Its totient is φ = 40851917793120.

The previous prime is 81880075558763. The next prime is 81880075558849. The reversal of 81880075558838 is 83885557008818.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20971793 + ... + 24567788.

It is an arithmetic number, because the mean of its divisors is an integer number (7692796659141).

Almost surely, 2^{81880075558838} is an apocalyptic number.

81880075558838 is a deficient number, since it is larger than the sum of its proper divisors (41204670987418).

81880075558838 is a wasteful number, since it uses less digits than its factorization.

81880075558838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45541519.

The product of its (nonzero) digits is 688128000, while the sum is 74.

The spelling of 81880075558838 in words is "eighty-one trillion, eight hundred eighty billion, seventy-five million, five hundred fifty-eight thousand, eight hundred thirty-eight".