645317274854 has 32 divisors (see below), whose sum is σ = 1112081218560. Its totient is φ = 275111088192.

The previous prime is 645317274827. The next prime is 645317274857. The reversal of 645317274854 is 458472713546.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 645317274854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645317274857) 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, 3294017 + ... + 3484419.

It is an arithmetic number, because the mean of its divisors is an integer number (34752538080).

Almost surely, 2^645317274854 is an apocalyptic number.

645317274854 is a deficient number, since it is larger than the sum of its proper divisors (466763943706).

645317274854 is a wasteful number, since it uses less digits than its factorization.

645317274854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191684.

The product of its digits is 22579200, while the sum is 56.

The spelling of 645317274854 in words is "six hundred forty-five billion, three hundred seventeen million, two hundred seventy-four thousand, eight hundred fifty-four".