664612323 has 4 divisors (see below), whose sum is σ = 886149768. Its totient is φ = 443074880.

The previous prime is 664612307. The next prime is 664612339. The reversal of 664612323 is 323216466.

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

It is an interprime number because it is at equal distance from previous prime (664612307) and next prime (664612339).

It is a cyclic number.

It is not a de Polignac number, because 664612323 - 2⁴ = 664612307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664612523) 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, 110768718 + ... + 110768723.

It is an arithmetic number, because the mean of its divisors is an integer number (221537442).

Almost surely, 2^664612323 is an apocalyptic number.

664612323 is a deficient number, since it is larger than the sum of its proper divisors (221537445).

664612323 is a wasteful number, since it uses less digits than its factorization.

664612323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221537444.

The product of its digits is 31104, while the sum is 33.

The square root of 664612323 is about 25780.0760860010. The cubic root of 664612323 is about 872.6822242086.

Adding to 664612323 its reverse (323216466), we get a palindrome (987828789).

The spelling of 664612323 in words is "six hundred sixty-four million, six hundred twelve thousand, three hundred twenty-three".