86507218581 has 32 divisors (see below), whose sum is σ = 132577320960. Its totient is φ = 49149457344.

The previous prime is 86507218561. The next prime is 86507218607. The reversal of 86507218581 is 18581270568.

It is not a de Polignac number, because 86507218581 - 2⁶ = 86507218517 is a prime.

It is a super-2 number, since 2×86507218581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86507218541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3871066 + ... + 3893348.

It is an arithmetic number, because the mean of its divisors is an integer number (4143041280).

Almost surely, 2^86507218581 is an apocalyptic number.

It is an amenable number.

86507218581 is a deficient number, since it is larger than the sum of its proper divisors (46070102379).

86507218581 is a wasteful number, since it uses less digits than its factorization.

86507218581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23345.

The product of its (nonzero) digits is 1075200, while the sum is 51.

The spelling of 86507218581 in words is "eighty-six billion, five hundred seven million, two hundred eighteen thousand, five hundred eighty-one".