6612661665 has 16 divisors (see below), whose sum is σ = 11755843200. Its totient is φ = 3526752816.

The previous prime is 6612661651. The next prime is 6612661669. The reversal of 6612661665 is 5661662166.

6612661665 is a `hidden beast` number, since 6 + 6 + 1 + 26 + 616 + 6 + 5 = 666.

It is not a de Polignac number, because 6612661665 - 2⁷ = 6612661537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6612661665.

It is not an unprimeable number, because it can be changed into a prime (6612661669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24491205 + ... + 24491474.

It is an arithmetic number, because the mean of its divisors is an integer number (734740200).

Almost surely, 2^6612661665 is an apocalyptic number.

It is an amenable number.

6612661665 is a deficient number, since it is larger than the sum of its proper divisors (5143181535).

6612661665 is a wasteful number, since it uses less digits than its factorization.

6612661665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48982693 (or 48982687 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 6612661665 is about 81318.2738687929. The cubic root of 6612661665 is about 1876.9762075901.

The spelling of 6612661665 in words is "six billion, six hundred twelve million, six hundred sixty-one thousand, six hundred sixty-five".