6666515612 has 12 divisors (see below), whose sum is σ = 11667966240. Its totient is φ = 3332810976.

The previous prime is 6666515587. The next prime is 6666515651. The reversal of 6666515612 is 2165156666.

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, 76937 + ... + 138752.

It is an arithmetic number, because the mean of its divisors is an integer number (972330520).

Almost surely, 2^6666515612 is an apocalyptic number.

It is an amenable number.

6666515612 is a deficient number, since it is larger than the sum of its proper divisors (5001450628).

6666515612 is a wasteful number, since it uses less digits than its factorization.

6666515612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223420 (or 223418 counting only the distinct ones).

The product of its digits is 388800, while the sum is 44.

The square root of 6666515612 is about 81648.7330703912. The cubic root of 6666515612 is about 1882.0578428663.

The spelling of 6666515612 in words is "six billion, six hundred sixty-six million, five hundred fifteen thousand, six hundred twelve".