666015233 has 4 divisors (see below), whose sum is σ = 717247188. Its totient is φ = 614783280.

The previous prime is 666015223. The next prime is 666015257. The reversal of 666015233 is 332510666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30118144 + 635897089 = 5488^2 + 25217^2 .

It is a cyclic number.

It is not a de Polignac number, because 666015233 - 2⁸ = 666014977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 666015233.

It is not an unprimeable number, because it can be changed into a prime (666015223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25615958 + ... + 25615983.

It is an arithmetic number, because the mean of its divisors is an integer number (179311797).

Almost surely, 2^666015233 is an apocalyptic number.

It is an amenable number.

666015233 is a deficient number, since it is larger than the sum of its proper divisors (51231955).

666015233 is a wasteful number, since it uses less digits than its factorization.

666015233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51231954.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 666015233 is about 25807.2709328205. The cubic root of 666015233 is about 873.2958321439.

Adding to 666015233 its reverse (332510666), we get a palindrome (998525899).

The spelling of 666015233 in words is "six hundred sixty-six million, fifteen thousand, two hundred thirty-three".