666322357 has 4 divisors (see below), whose sum is σ = 689299020. Its totient is φ = 643345696.

The previous prime is 666322331. The next prime is 666322387. The reversal of 666322357 is 753223666.

It is a happy number.

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 425638161 + 240684196 = 20631^2 + 15514^2 .

It is a cyclic number.

It is not a de Polignac number, because 666322357 - 2¹⁹ = 665798069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666322387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11488288 + ... + 11488345.

It is an arithmetic number, because the mean of its divisors is an integer number (172324755).

Almost surely, 2^666322357 is an apocalyptic number.

It is an amenable number.

666322357 is a deficient number, since it is larger than the sum of its proper divisors (22976663).

666322357 is a wasteful number, since it uses less digits than its factorization.

666322357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22976662.

The product of its digits is 272160, while the sum is 40.

The square root of 666322357 is about 25813.2205855837. The cubic root of 666322357 is about 873.4300477390.

The spelling of 666322357 in words is "six hundred sixty-six million, three hundred twenty-two thousand, three hundred fifty-seven".