661044916 has 12 divisors (see below), whose sum is σ = 1322089888. Its totient is φ = 283304952.

The previous prime is 661044893. The next prime is 661044947. The reversal of 661044916 is 619440166.

661044916 is an admirable 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, 11804346 + ... + 11804401.

Almost surely, 2^661044916 is an apocalyptic number.

It is an amenable number.

661044916 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

661044916 is a wasteful number, since it uses less digits than its factorization.

661044916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23608758 (or 23608756 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 661044916 is about 25710.7937644873. The cubic root of 661044916 is about 871.1180042613.

The spelling of 661044916 in words is "six hundred sixty-one million, forty-four thousand, nine hundred sixteen".