664325023 has 2 divisors, whose sum is σ = 664325024. Its totient is φ = 664325022.

The previous prime is 664324981. The next prime is 664325029. The reversal of 664325023 is 320523466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664325023 - 2²¹ = 662227871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664325029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332162511 + 332162512.

It is an arithmetic number, because the mean of its divisors is an integer number (332162512).

Almost surely, 2^664325023 is an apocalyptic number.

664325023 is a deficient number, since it is larger than the sum of its proper divisors (1).

664325023 is an equidigital number, since it uses as much as digits as its factorization.

664325023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 664325023 is about 25774.5033511802. The cubic root of 664325023 is about 872.5564577879.

Adding to 664325023 its reverse (320523466), we get a palindrome (984848489).

The spelling of 664325023 in words is "six hundred sixty-four million, three hundred twenty-five thousand, twenty-three".