645104466 has 32 divisors (see below), whose sum is σ = 1457870400. Its totient is φ = 211389120.

The previous prime is 645104459. The next prime is 645104477. The reversal of 645104466 is 664401546.

645104466 is a `hidden beast` number, since 645 + 1 + 0 + 4 + 4 + 6 + 6 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 645104466.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98055 + ... + 104426.

It is an arithmetic number, because the mean of its divisors is an integer number (45558450).

Almost surely, 2^645104466 is an apocalyptic number.

645104466 is an abundant number, since it is smaller than the sum of its proper divisors (812765934).

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

645104466 is a wasteful number, since it uses less digits than its factorization.

645104466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202551 (or 202545 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 645104466 is about 25398.9067874978. The cubic root of 645104466 is about 864.0589031987.

It can be divided in two parts, 645 and 104466, that added together give a triangular number (105111 = T₄₅₈).

The spelling of 645104466 in words is "six hundred forty-five million, one hundred four thousand, four hundred sixty-six".