666165115 has 16 divisors (see below), whose sum is σ = 996652800. Its totient is φ = 415271520.

The previous prime is 666165113. The next prime is 666165127. The reversal of 666165115 is 511561666.

It is not a de Polignac number, because 666165115 - 2¹ = 666165113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (666165113) 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, 864765 + ... + 865534.

It is an arithmetic number, because the mean of its divisors is an integer number (62290800).

Almost surely, 2^666165115 is an apocalyptic number.

666165115 is a deficient number, since it is larger than the sum of its proper divisors (330487685).

666165115 is a wasteful number, since it uses less digits than its factorization.

666165115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730322.

The product of its digits is 32400, while the sum is 37.

The square root of 666165115 is about 25810.1746410209. The cubic root of 666165115 is about 873.3613369061.

It can be divided in two parts, 6661651 and 15, that added together give a palindrome (6661666).

The spelling of 666165115 in words is "six hundred sixty-six million, one hundred sixty-five thousand, one hundred fifteen".