645770116 has 12 divisors (see below), whose sum is σ = 1142796060. Its totient is φ = 319256960.

The previous prime is 645770089. The next prime is 645770161. The reversal of 645770116 is 611077546.

It can be written as a sum of positive squares in 2 ways, for example, as 265364100 + 380406016 = 16290^2 + 19504^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 906625 + ... + 907336.

It is an arithmetic number, because the mean of its divisors is an integer number (95233005).

Almost surely, 2^645770116 is an apocalyptic number.

It is an amenable number.

645770116 is a deficient number, since it is larger than the sum of its proper divisors (497025944).

645770116 is a wasteful number, since it uses less digits than its factorization.

645770116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1814054 (or 1814052 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 645770116 is about 25412.0073193756. The cubic root of 645770116 is about 864.3559936320.

The spelling of 645770116 in words is "six hundred forty-five million, seven hundred seventy thousand, one hundred sixteen".