645041616 has 20 divisors (see below), whose sum is σ = 1666357632. Its totient is φ = 215013856.

The previous prime is 645041587. The next prime is 645041669. The reversal of 645041616 is 616140546.

It is a happy number.

It is a congruent number.

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, 6719136 + ... + 6719231.

Almost surely, 2^645041616 is an apocalyptic number.

It is an amenable number.

645041616 is an abundant number, since it is smaller than the sum of its proper divisors (1021316016).

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

645041616 is a wasteful number, since it uses less digits than its factorization.

645041616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13438378 (or 13438372 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 645041616 is about 25397.6694993852. The cubic root of 645041616 is about 864.0308416631.

The spelling of 645041616 in words is "six hundred forty-five million, forty-one thousand, six hundred sixteen".