663665963 has 2 divisors, whose sum is σ = 663665964. Its totient is φ = 663665962.

The previous prime is 663665939. The next prime is 663665983. The reversal of 663665963 is 369566366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663665963 - 2²⁰ = 662617387 is a prime.

It is not a weakly prime, because it can be changed into another prime (663665903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331832981 + 331832982.

It is an arithmetic number, because the mean of its divisors is an integer number (331832982).

Almost surely, 2^663665963 is an apocalyptic number.

663665963 is a deficient number, since it is larger than the sum of its proper divisors (1).

663665963 is an equidigital number, since it uses as much as digits as its factorization.

663665963 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3149280, while the sum is 50.

The square root of 663665963 is about 25761.7150632484. The cubic root of 663665963 is about 872.2678152741.

The spelling of 663665963 in words is "six hundred sixty-three million, six hundred sixty-five thousand, nine hundred sixty-three".