6661655115 has 32 divisors (see below), whose sum is σ = 10799792640. Its totient is φ = 3505936896.

The previous prime is 6661655093. The next prime is 6661655123. The reversal of 6661655115 is 5115561666.

It is not a de Polignac number, because 6661655115 - 2⁵ = 6661655083 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1253554 + ... + 1258856.

It is an arithmetic number, because the mean of its divisors is an integer number (337493520).

Almost surely, 2^6661655115 is an apocalyptic number.

6661655115 is a deficient number, since it is larger than the sum of its proper divisors (4138137525).

6661655115 is a wasteful number, since it uses less digits than its factorization.

6661655115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6403.

The product of its digits is 162000, while the sum is 42.

The square root of 6661655115 is about 81618.9629620470. The cubic root of 6661655115 is about 1881.6003344711.

The spelling of 6661655115 in words is "six billion, six hundred sixty-one million, six hundred fifty-five thousand, one hundred fifteen".