645065305164 has 36 divisors (see below), whose sum is σ = 1863521993424. Its totient is φ = 184304372832.

The previous prime is 645065305139. The next prime is 645065305187. The reversal of 645065305164 is 461503560546.

645065305164 is a `hidden beast` number, since 6 + 4 + 5 + 0 + 6 + 530 + 51 + 64 = 666.

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

It is a super-2 number, since 2×645065305164² (a number of 24 digits) contains 22 as substring.

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, 1279891227 + ... + 1279891730.

Almost surely, 2^645065305164 is an apocalyptic number.

It is an amenable number.

645065305164 is an abundant number, since it is smaller than the sum of its proper divisors (1218456688260).

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

645065305164 is a wasteful number, since it uses less digits than its factorization.

645065305164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2559782974 (or 2559782969 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 45.

The spelling of 645065305164 in words is "six hundred forty-five billion, sixty-five million, three hundred five thousand, one hundred sixty-four".