664355423 has 2 divisors, whose sum is σ = 664355424. Its totient is φ = 664355422.

The previous prime is 664355413. The next prime is 664355441. The reversal of 664355423 is 324553466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664355423 - 2¹² = 664351327 is a prime.

It is a super-3 number, since 3×664355423³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664355413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332177711 + 332177712.

It is an arithmetic number, because the mean of its divisors is an integer number (332177712).

Almost surely, 2^664355423 is an apocalyptic number.

664355423 is a deficient number, since it is larger than the sum of its proper divisors (1).

664355423 is an equidigital number, since it uses as much as digits as its factorization.

664355423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 38.

The square root of 664355423 is about 25775.0930745167. The cubic root of 664355423 is about 872.5697671925.

The spelling of 664355423 in words is "six hundred sixty-four million, three hundred fifty-five thousand, four hundred twenty-three".