645475564 has 6 divisors (see below), whose sum is σ = 1129582244. Its totient is φ = 322737780.

The previous prime is 645475553. The next prime is 645475577. The reversal of 645475564 is 465574546.

It is a super-2 number, since 2×645475564² = 833277407442236192, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80684442 + ... + 80684449.

Almost surely, 2^645475564 is an apocalyptic number.

It is an amenable number.

645475564 is a deficient number, since it is larger than the sum of its proper divisors (484106680).

645475564 is a wasteful number, since it uses less digits than its factorization.

645475564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161368895 (or 161368893 counting only the distinct ones).

The product of its digits is 2016000, while the sum is 46.

The square root of 645475564 is about 25406.2111303516. The cubic root of 645475564 is about 864.2245554728.

The spelling of 645475564 in words is "six hundred forty-five million, four hundred seventy-five thousand, five hundred sixty-four".