863621868321 has 8 divisors (see below), whose sum is σ = 1279439804960. Its totient is φ = 575747912196.

The previous prime is 863621868293. The next prime is 863621868331. The reversal of 863621868321 is 123868126368.

863621868321 is a `hidden beast` number, since 8 + 6 + 3 + 621 + 8 + 6 + 8 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 863621868321 - 2¹⁵ = 863621835553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (863621868331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15992997535 + ... + 15992997588.

It is an arithmetic number, because the mean of its divisors is an integer number (159929975620).

Almost surely, 2^863621868321 is an apocalyptic number.

It is an amenable number.

863621868321 is a deficient number, since it is larger than the sum of its proper divisors (415817936639).

863621868321 is a wasteful number, since it uses less digits than its factorization.

863621868321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31985995132 (or 31985995126 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The spelling of 863621868321 in words is "eight hundred sixty-three billion, six hundred twenty-one million, eight hundred sixty-eight thousand, three hundred twenty-one".