645412116 has 12 divisors (see below), whose sum is σ = 1505961632. Its totient is φ = 215137368.

The previous prime is 645412109. The next prime is 645412129. The reversal of 645412116 is 611214546.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26892160 + ... + 26892183.

Almost surely, 2^645412116 is an apocalyptic number.

It is an amenable number.

645412116 is an abundant number, since it is smaller than the sum of its proper divisors (860549516).

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

645412116 is a wasteful number, since it uses less digits than its factorization.

645412116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53784350 (or 53784348 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 645412116 is about 25404.9624286280. The cubic root of 645412116 is about 864.1962377903.

The spelling of 645412116 in words is "six hundred forty-five million, four hundred twelve thousand, one hundred sixteen".