645317212374 has 24 divisors (see below), whose sum is σ = 1480433605560. Its totient is φ = 202452458688.

The previous prime is 645317212321. The next prime is 645317212403. The reversal of 645317212374 is 473212713546.

It is a happy number.

645317212374 is a `hidden beast` number, since 6 + 4 + 53 + 17 + 212 + 374 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1054439584 + ... + 1054440195.

It is an arithmetic number, because the mean of its divisors is an integer number (61684733565).

Almost surely, 2^645317212374 is an apocalyptic number.

645317212374 is an abundant number, since it is smaller than the sum of its proper divisors (835116393186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645317212374 is a wasteful number, since it uses less digits than its factorization.

645317212374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108879804 (or 2108879801 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The spelling of 645317212374 in words is "six hundred forty-five billion, three hundred seventeen million, two hundred twelve thousand, three hundred seventy-four".