663088997 has 2 divisors, whose sum is σ = 663088998. Its totient is φ = 663088996.

The previous prime is 663088991. The next prime is 663089027. The reversal of 663088997 is 799880366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661055521 + 2033476 = 25711^2 + 1426^2 .

It is a cyclic number.

It is not a de Polignac number, because 663088997 - 2²² = 658894693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663088991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331544498 + 331544499.

It is an arithmetic number, because the mean of its divisors is an integer number (331544499).

Almost surely, 2^663088997 is an apocalyptic number.

It is an amenable number.

663088997 is a deficient number, since it is larger than the sum of its proper divisors (1).

663088997 is an equidigital number, since it uses as much as digits as its factorization.

663088997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The square root of 663088997 is about 25750.5144997144. The cubic root of 663088997 is about 872.0149698108.

The spelling of 663088997 in words is "six hundred sixty-three million, eighty-eight thousand, nine hundred ninety-seven".