664020023 has 2 divisors, whose sum is σ = 664020024. Its totient is φ = 664020022.

The previous prime is 664020013. The next prime is 664020029. The reversal of 664020023 is 320020466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664020023 - 2⁸ = 664019767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664020029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332010011 + 332010012.

It is an arithmetic number, because the mean of its divisors is an integer number (332010012).

Almost surely, 2^664020023 is an apocalyptic number.

664020023 is a deficient number, since it is larger than the sum of its proper divisors (1).

664020023 is an equidigital number, since it uses as much as digits as its factorization.

664020023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 664020023 is about 25768.5859720707. The cubic root of 664020023 is about 872.4229034539.

Adding to 664020023 its reverse (320020466), we get a palindrome (984040489).

The spelling of 664020023 in words is "six hundred sixty-four million, twenty thousand, twenty-three".