81952745175 has 72 divisors (see below), whose sum is σ = 168018940544. Its totient is φ = 37405385280.

The previous prime is 81952745137. The next prime is 81952745177. The reversal of 81952745175 is 57154725918.

81952745175 is a `hidden beast` number, since 8 + 1 + 9 + 52 + 74 + 517 + 5 = 666.

It is not a de Polignac number, because 81952745175 - 2⁶ = 81952745111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81952745177) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 972264 + ... + 1053186.

Almost surely, 2^81952745175 is an apocalyptic number.

81952745175 is an abundant number, since it is smaller than the sum of its proper divisors (86066195369).

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

81952745175 is a wasteful number, since it uses less digits than its factorization.

81952745175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81589 (or 81581 counting only the distinct ones).

The product of its digits is 3528000, while the sum is 54.

The spelling of 81952745175 in words is "eighty-one billion, nine hundred fifty-two million, seven hundred forty-five thousand, one hundred seventy-five".