866982925531 has 4 divisors (see below), whose sum is σ = 887145319192. Its totient is φ = 846820531872.

The previous prime is 866982925519. The next prime is 866982925559. The reversal of 866982925531 is 135529289668.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866982925531 is a prime.

It is a super-2 number, since 2×866982925531² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866982925031) 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, 10081196766 + ... + 10081196851.

It is an arithmetic number, because the mean of its divisors is an integer number (221786329798).

Almost surely, 2^866982925531 is an apocalyptic number.

866982925531 is a deficient number, since it is larger than the sum of its proper divisors (20162393661).

866982925531 is a wasteful number, since it uses less digits than its factorization.

866982925531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20162393660.

The product of its digits is 55987200, while the sum is 64.

The spelling of 866982925531 in words is "eight hundred sixty-six billion, nine hundred eighty-two million, nine hundred twenty-five thousand, five hundred thirty-one".