664364401 has 2 divisors, whose sum is σ = 664364402. Its totient is φ = 664364400.

The previous prime is 664364383. The next prime is 664364413. The reversal of 664364401 is 104463466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474586225 + 189778176 = 21785^2 + 13776^2 .

It is a cyclic number.

It is not a de Polignac number, because 664364401 - 2¹¹ = 664362353 is a prime.

It is not a weakly prime, because it can be changed into another prime (664364501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332182200 + 332182201.

It is an arithmetic number, because the mean of its divisors is an integer number (332182201).

Almost surely, 2^664364401 is an apocalyptic number.

It is an amenable number.

664364401 is a deficient number, since it is larger than the sum of its proper divisors (1).

664364401 is an equidigital number, since it uses as much as digits as its factorization.

664364401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 664364401 is about 25775.2672343082. The cubic root of 664364401 is about 872.5736977673.

The spelling of 664364401 in words is "six hundred sixty-four million, three hundred sixty-four thousand, four hundred one".