864511216635 has 32 divisors (see below), whose sum is σ = 1510236617472. Its totient is φ = 418803735680.

The previous prime is 864511216619. The next prime is 864511216651. The reversal of 864511216635 is 536612115468.

It is an interprime number because it is at equal distance from previous prime (864511216619) and next prime (864511216651).

It is not a de Polignac number, because 864511216635 - 2⁴ = 864511216619 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2011164 + ... + 2402873.

It is an arithmetic number, because the mean of its divisors is an integer number (47194894296).

Almost surely, 2^864511216635 is an apocalyptic number.

864511216635 is a deficient number, since it is larger than the sum of its proper divisors (645725400837).

864511216635 is a wasteful number, since it uses less digits than its factorization.

864511216635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415243.

The product of its digits is 1036800, while the sum is 48.

The spelling of 864511216635 in words is "eight hundred sixty-four billion, five hundred eleven million, two hundred sixteen thousand, six hundred thirty-five".