6615016665 has 16 divisors (see below), whose sum is σ = 10655064000. Its totient is φ = 3504329792.

The previous prime is 6615016663. The next prime is 6615016669. The reversal of 6615016665 is 5666105166.

It is a cyclic number.

It is not a de Polignac number, because 6615016665 - 2¹ = 6615016663 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6615016663) 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, 1477635 + ... + 1482104.

It is an arithmetic number, because the mean of its divisors is an integer number (665941500).

Almost surely, 2^6615016665 is an apocalyptic number.

It is an amenable number.

6615016665 is a deficient number, since it is larger than the sum of its proper divisors (4040047335).

6615016665 is a wasteful number, since it uses less digits than its factorization.

6615016665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2959896.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 6615016665 is about 81332.7527199221. The cubic root of 6615016665 is about 1877.1990000933.

The spelling of 6615016665 in words is "six billion, six hundred fifteen million, sixteen thousand, six hundred sixty-five".