666615052 has 12 divisors (see below), whose sum is σ = 1172622136. Its totient is φ = 331580160.

The previous prime is 666615013. The next prime is 666615091. The reversal of 666615052 is 250516666.

It is an interprime number because it is at equal distance from previous prime (666615013) and next prime (666615091).

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, 430974 + ... + 432517.

Almost surely, 2^666615052 is an apocalyptic number.

It is an amenable number.

666615052 is a deficient number, since it is larger than the sum of its proper divisors (506007084).

666615052 is a wasteful number, since it uses less digits than its factorization.

666615052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863688 (or 863686 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 666615052 is about 25818.8894416472. The cubic root of 666615052 is about 873.5579193722.

The spelling of 666615052 in words is "six hundred sixty-six million, six hundred fifteen thousand, fifty-two".