87918639571 has 4 divisors (see below), whose sum is σ = 100478445232. Its totient is φ = 75358833912.

The previous prime is 87918639521. The next prime is 87918639623. The reversal of 87918639571 is 17593681978.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87918639571 - 2³¹ = 85771155923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87918639521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6279902820 + ... + 6279902833.

It is an arithmetic number, because the mean of its divisors is an integer number (25119611308).

Almost surely, 2^87918639571 is an apocalyptic number.

87918639571 is a deficient number, since it is larger than the sum of its proper divisors (12559805661).

87918639571 is a wasteful number, since it uses less digits than its factorization.

87918639571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12559805660.

The product of its digits is 22861440, while the sum is 64.

The spelling of 87918639571 in words is "eighty-seven billion, nine hundred eighteen million, six hundred thirty-nine thousand, five hundred seventy-one".