660439616 has 14 divisors (see below), whose sum is σ = 1310559990. Its totient is φ = 330219776.

The previous prime is 660439561. The next prime is 660439627. The reversal of 660439616 is 616934066.

It can be written as a sum of positive squares in only one way, i.e., 650454016 + 9985600 = 25504^2 + 3160^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5159621 + ... + 5159748.

Almost surely, 2^660439616 is an apocalyptic number.

It is an amenable number.

660439616 is a deficient number, since it is larger than the sum of its proper divisors (650120374).

660439616 is a wasteful number, since it uses less digits than its factorization.

660439616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10319381 (or 10319371 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 660439616 is about 25699.0197478425. The cubic root of 660439616 is about 870.8520370842.

The spelling of 660439616 in words is "six hundred sixty million, four hundred thirty-nine thousand, six hundred sixteen".