663575617 has 2 divisors, whose sum is σ = 663575618. Its totient is φ = 663575616.

The previous prime is 663575573. The next prime is 663575623. The reversal of 663575617 is 716575366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 599319361 + 64256256 = 24481^2 + 8016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663575617 is a prime.

It is not a weakly prime, because it can be changed into another prime (663572617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331787808 + 331787809.

It is an arithmetic number, because the mean of its divisors is an integer number (331787809).

Almost surely, 2^663575617 is an apocalyptic number.

It is an amenable number.

663575617 is a deficient number, since it is larger than the sum of its proper divisors (1).

663575617 is an equidigital number, since it uses as much as digits as its factorization.

663575617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 793800, while the sum is 46.

The square root of 663575617 is about 25759.9615100644. The cubic root of 663575617 is about 872.2282323671.

The spelling of 663575617 in words is "six hundred sixty-three million, five hundred seventy-five thousand, six hundred seventeen".