86585721571 has 4 divisors (see below), whose sum is σ = 86587078032. Its totient is φ = 86584365112.

The previous prime is 86585721559. The next prime is 86585721581. The reversal of 86585721571 is 17512758568.

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 86585721571 - 2²⁵ = 86552167139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86585721581) 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, 577495 + ... + 711808.

It is an arithmetic number, because the mean of its divisors is an integer number (21646769508).

Almost surely, 2^86585721571 is an apocalyptic number.

86585721571 is a deficient number, since it is larger than the sum of its proper divisors (1356461).

86585721571 is a wasteful number, since it uses less digits than its factorization.

86585721571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356460.

The product of its digits is 4704000, while the sum is 55.

The spelling of 86585721571 in words is "eighty-six billion, five hundred eighty-five million, seven hundred twenty-one thousand, five hundred seventy-one".