645350795244 has 36 divisors (see below), whose sum is σ = 1702229636016. Its totient is φ = 205764021408.

The previous prime is 645350795233. The next prime is 645350795281. The reversal of 645350795244 is 442597053546.

It is a happy number.

645350795244 is a `hidden beast` number, since 6 + 4 + 5 + 3 + 507 + 95 + 2 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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, 389703759 + ... + 389705414.

It is an arithmetic number, because the mean of its divisors is an integer number (47284156556).

Almost surely, 2^645350795244 is an apocalyptic number.

It is an amenable number.

645350795244 is an abundant number, since it is smaller than the sum of its proper divisors (1056878840772).

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

645350795244 is a wasteful number, since it uses less digits than its factorization.

645350795244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779409206 (or 779409201 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 54.

The spelling of 645350795244 in words is "six hundred forty-five billion, three hundred fifty million, seven hundred ninety-five thousand, two hundred forty-four".