645316264651 has 16 divisors (see below), whose sum is σ = 681719731200. Its totient is φ = 609160432608.

The previous prime is 645316264639. The next prime is 645316264759. The reversal of 645316264651 is 156462613546.

It is a cyclic number.

It is not a de Polignac number, because 645316264651 - 2⁹ = 645316264139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 645316264595 and 645316264604.

It is not an unprimeable number, because it can be changed into a prime (645316264951) 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, 6321030 + ... + 6422308.

It is an arithmetic number, because the mean of its divisors is an integer number (42607483200).

Almost surely, 2^645316264651 is an apocalyptic number.

645316264651 is a deficient number, since it is larger than the sum of its proper divisors (36403466549).

645316264651 is a wasteful number, since it uses less digits than its factorization.

645316264651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102498.

The product of its digits is 3110400, while the sum is 49.

The spelling of 645316264651 in words is "six hundred forty-five billion, three hundred sixteen million, two hundred sixty-four thousand, six hundred fifty-one".