664737009197 has 2 divisors, whose sum is σ = 664737009198. Its totient is φ = 664737009196.

The previous prime is 664737009193. The next prime is 664737009227. The reversal of 664737009197 is 791900737466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664736918596 + 90601 = 815314^2 + 301^2 .

It is a cyclic number.

It is not a de Polignac number, because 664737009197 - 2² = 664737009193 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664737009193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332368504598 + 332368504599.

It is an arithmetic number, because the mean of its divisors is an integer number (332368504599).

Almost surely, 2^664737009197 is an apocalyptic number.

It is an amenable number.

664737009197 is a deficient number, since it is larger than the sum of its proper divisors (1).

664737009197 is an equidigital number, since it uses as much as digits as its factorization.

664737009197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12002256, while the sum is 59.

The spelling of 664737009197 in words is "six hundred sixty-four billion, seven hundred thirty-seven million, nine thousand, one hundred ninety-seven".