666660616 has 16 divisors (see below), whose sum is σ = 1250557740. Its totient is φ = 333178560.

The previous prime is 666660587. The next prime is 666660623. The reversal of 666660616 is 616066666.

It can be written as a sum of positive squares in 2 ways, for example, as 652598116 + 14062500 = 25546^2 + 3750^2 .

It is a super-3 number, since 3×666660616³ (a number of 27 digits) contains 333 as substring.

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, 930 + ... + 36526.

Almost surely, 2^666660616 is an apocalyptic number.

It is an amenable number.

666660616 is a deficient number, since it is larger than the sum of its proper divisors (583897124).

666660616 is a wasteful number, since it uses less digits than its factorization.

666660616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37944 (or 37940 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 43.

The square root of 666660616 is about 25819.7718037941. The cubic root of 666660616 is about 873.5778218562.

The spelling of 666660616 in words is "six hundred sixty-six million, six hundred sixty thousand, six hundred sixteen".