866982643631 has 4 divisors (see below), whose sum is σ = 933673616232. Its totient is φ = 800291671032.

The previous prime is 866982643613. The next prime is 866982643679. The reversal of 866982643631 is 136346289668.

It is a happy number.

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 866982643631 - 2¹⁰ = 866982642607 is a prime.

It is a super-2 number, since 2×866982643631² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866982643031) 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, 33345486281 + ... + 33345486306.

It is an arithmetic number, because the mean of its divisors is an integer number (233418404058).

Almost surely, 2^866982643631 is an apocalyptic number.

866982643631 is a deficient number, since it is larger than the sum of its proper divisors (66690972601).

866982643631 is a wasteful number, since it uses less digits than its factorization.

866982643631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66690972600.

The product of its digits is 53747712, while the sum is 62.

The spelling of 866982643631 in words is "eight hundred sixty-six billion, nine hundred eighty-two million, six hundred forty-three thousand, six hundred thirty-one".