666613233 has 120 divisors (see below), whose sum is σ = 1243550880. Its totient is φ = 351786240.

The previous prime is 666613229. The next prime is 666613237. The reversal of 666613233 is 332316666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (666613229) and next prime (666613237).

It is not a de Polignac number, because 666613233 - 2² = 666613229 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666613237) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 2860885 + ... + 2861117.

It is an arithmetic number, because the mean of its divisors is an integer number (10362924).

Almost surely, 2^666613233 is an apocalyptic number.

It is an amenable number.

666613233 is a deficient number, since it is larger than the sum of its proper divisors (576937647).

666613233 is a wasteful number, since it uses less digits than its factorization.

666613233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 279 counting only the distinct ones).

The product of its digits is 69984, while the sum is 36.

The square root of 666613233 is about 25818.8542154759. The cubic root of 666613233 is about 873.5571248090.

Adding to 666613233 its reverse (332316666), we get a palindrome (998929899).

The spelling of 666613233 in words is "six hundred sixty-six million, six hundred thirteen thousand, two hundred thirty-three".