664451597 has 2 divisors, whose sum is σ = 664451598. Its totient is φ = 664451596.

The previous prime is 664451591. The next prime is 664451611. The reversal of 664451597 is 795154466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 419184676 + 245266921 = 20474^2 + 15661^2 .

It is a cyclic number.

It is not a de Polignac number, because 664451597 - 2⁶ = 664451533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664451591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332225798 + 332225799.

It is an arithmetic number, because the mean of its divisors is an integer number (332225799).

Almost surely, 2^664451597 is an apocalyptic number.

It is an amenable number.

664451597 is a deficient number, since it is larger than the sum of its proper divisors (1).

664451597 is an equidigital number, since it uses as much as digits as its factorization.

664451597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 907200, while the sum is 47.

The square root of 664451597 is about 25776.9586452708. The cubic root of 664451597 is about 872.6118703965.

The spelling of 664451597 in words is "six hundred sixty-four million, four hundred fifty-one thousand, five hundred ninety-seven".