663689597 has 2 divisors, whose sum is σ = 663689598. Its totient is φ = 663689596.

The previous prime is 663689581. The next prime is 663689629. The reversal of 663689597 is 795986366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 490135321 + 173554276 = 22139^2 + 13174^2 .

It is a cyclic number.

It is not a de Polignac number, because 663689597 - 2⁴ = 663689581 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663689527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331844798 + 331844799.

It is an arithmetic number, because the mean of its divisors is an integer number (331844799).

Almost surely, 2^663689597 is an apocalyptic number.

It is an amenable number.

663689597 is a deficient number, since it is larger than the sum of its proper divisors (1).

663689597 is an equidigital number, since it uses as much as digits as its factorization.

663689597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14696640, while the sum is 59.

The square root of 663689597 is about 25762.1737630969. The cubic root of 663689597 is about 872.2781693448.

The spelling of 663689597 in words is "six hundred sixty-three million, six hundred eighty-nine thousand, five hundred ninety-seven".