664423117 has 2 divisors, whose sum is σ = 664423118. Its totient is φ = 664423116.

The previous prime is 664423099. The next prime is 664423129. The reversal of 664423117 is 711324466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 594433161 + 69989956 = 24381^2 + 8366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664423117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664423187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332211558 + 332211559.

It is an arithmetic number, because the mean of its divisors is an integer number (332211559).

Almost surely, 2^664423117 is an apocalyptic number.

It is an amenable number.

664423117 is a deficient number, since it is larger than the sum of its proper divisors (1).

664423117 is an equidigital number, since it uses as much as digits as its factorization.

664423117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 34.

The square root of 664423117 is about 25776.4062080035. The cubic root of 664423117 is about 872.5994028011.

The spelling of 664423117 in words is "six hundred sixty-four million, four hundred twenty-three thousand, one hundred seventeen".