645623046651 has 16 divisors (see below), whose sum is σ = 960927327360. Its totient is φ = 382187003520.

The previous prime is 645623046619. The next prime is 645623046659. The reversal of 645623046651 is 156640326546.

645623046651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645623046651 - 2⁵ = 645623046619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645623046651.

It is not an unprimeable number, because it can be changed into a prime (645623046659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227490846 + ... + 227493683.

It is an arithmetic number, because the mean of its divisors is an integer number (60057957960).

Almost surely, 2^645623046651 is an apocalyptic number.

645623046651 is a deficient number, since it is larger than the sum of its proper divisors (315304280709).

645623046651 is a wasteful number, since it uses less digits than its factorization.

645623046651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454984586.

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 645623046651 in words is "six hundred forty-five billion, six hundred twenty-three million, forty-six thousand, six hundred fifty-one".