664927997 has 2 divisors, whose sum is σ = 664927998. Its totient is φ = 664927996.

The previous prime is 664927969. The next prime is 664928003. The reversal of 664927997 is 799729466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 664917796 + 10201 = 25786^2 + 101^2 .

It is a cyclic number.

It is not a de Polignac number, because 664927997 - 2¹⁰ = 664926973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664927927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332463998 + 332463999.

It is an arithmetic number, because the mean of its divisors is an integer number (332463999).

Almost surely, 2^664927997 is an apocalyptic number.

It is an amenable number.

664927997 is a deficient number, since it is larger than the sum of its proper divisors (1).

664927997 is an equidigital number, since it uses as much as digits as its factorization.

664927997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 59.

The square root of 664927997 is about 25786.1978003737. The cubic root of 664927997 is about 872.8203696480.

The spelling of 664927997 in words is "six hundred sixty-four million, nine hundred twenty-seven thousand, nine hundred ninety-seven".