81174051875 has 40 divisors (see below), whose sum is σ = 117323044608. Its totient is φ = 54991332000.

The previous prime is 81174051863. The next prime is 81174051919. The reversal of 81174051875 is 57815047118.

It is not a de Polignac number, because 81174051875 - 2¹⁴ = 81174035491 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 251354 + ... + 474896.

Almost surely, 2^81174051875 is an apocalyptic number.

81174051875 is a deficient number, since it is larger than the sum of its proper divisors (36148992733).

81174051875 is an equidigital number, since it uses as much as digits as its factorization.

81174051875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223653 (or 223638 counting only the distinct ones).

The product of its (nonzero) digits is 313600, while the sum is 47.

The spelling of 81174051875 in words is "eighty-one billion, one hundred seventy-four million, fifty-one thousand, eight hundred seventy-five".