666788115 has 32 divisors (see below), whose sum is σ = 1220405760. Its totient is φ = 304533504.

The previous prime is 666788069. The next prime is 666788131. The reversal of 666788115 is 511887666.

It is not a de Polignac number, because 666788115 - 2²⁴ = 650010899 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, 145692 + ... + 150198.

It is an arithmetic number, because the mean of its divisors is an integer number (38137680).

Almost surely, 2^666788115 is an apocalyptic number.

666788115 is a deficient number, since it is larger than the sum of its proper divisors (553617645).

666788115 is a wasteful number, since it uses less digits than its factorization.

666788115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5931.

The product of its digits is 483840, while the sum is 48.

The square root of 666788115 is about 25822.2407044780. The cubic root of 666788115 is about 873.6335089611.

The spelling of 666788115 in words is "six hundred sixty-six million, seven hundred eighty-eight thousand, one hundred fifteen".