664376417 has 2 divisors, whose sum is σ = 664376418. Its totient is φ = 664376416.

The previous prime is 664376411. The next prime is 664376441. The reversal of 664376417 is 714673466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 596873761 + 67502656 = 24431^2 + 8216^2 .

It is a cyclic number.

It is not a de Polignac number, because 664376417 - 2¹⁴ = 664360033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (664376411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332188208 + 332188209.

It is an arithmetic number, because the mean of its divisors is an integer number (332188209).

Almost surely, 2^664376417 is an apocalyptic number.

It is an amenable number.

664376417 is a deficient number, since it is larger than the sum of its proper divisors (1).

664376417 is an equidigital number, since it uses as much as digits as its factorization.

664376417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 44.

The square root of 664376417 is about 25775.5003249210. The cubic root of 664376417 is about 872.5789583253.

The spelling of 664376417 in words is "six hundred sixty-four million, three hundred seventy-six thousand, four hundred seventeen".