81885573715 has 32 divisors (see below), whose sum is σ = 109936673280. Its totient is φ = 58033708800.

The previous prime is 81885573709. The next prime is 81885573739. The reversal of 81885573715 is 51737558818.

It is a happy number.

It is not a de Polignac number, because 81885573715 - 2²⁵ = 81852019283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81885573715.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1979716 + ... + 2020654.

It is an arithmetic number, because the mean of its divisors is an integer number (3435521040).

Almost surely, 2^81885573715 is an apocalyptic number.

81885573715 is a deficient number, since it is larger than the sum of its proper divisors (28051099565).

81885573715 is a wasteful number, since it uses less digits than its factorization.

81885573715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41883.

The product of its digits is 9408000, while the sum is 58.

The spelling of 81885573715 in words is "eighty-one billion, eight hundred eighty-five million, five hundred seventy-three thousand, seven hundred fifteen".