6661665115 has 8 divisors (see below), whose sum is σ = 9135997920. Its totient is φ = 4567998912.

The previous prime is 6661665103. The next prime is 6661665121. The reversal of 6661665115 is 5115661666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6661665115 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95166610 + ... + 95166679.

It is an arithmetic number, because the mean of its divisors is an integer number (1141999740).

Almost surely, 2^6661665115 is an apocalyptic number.

6661665115 is a deficient number, since it is larger than the sum of its proper divisors (2474332805).

6661665115 is a wasteful number, since it uses less digits than its factorization.

6661665115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190333301.

The product of its digits is 194400, while the sum is 43.

The square root of 6661665115 is about 81619.0242222976. The cubic root of 6661665115 is about 1881.6012759786.

The spelling of 6661665115 in words is "six billion, six hundred sixty-one million, six hundred sixty-five thousand, one hundred fifteen".