663296861 has 2 divisors, whose sum is σ = 663296862. Its totient is φ = 663296860.

The previous prime is 663296849. The next prime is 663296869. The reversal of 663296861 is 168692366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660181636 + 3115225 = 25694^2 + 1765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663296861 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 (663296869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331648430 + 331648431.

It is an arithmetic number, because the mean of its divisors is an integer number (331648431).

Almost surely, 2^663296861 is an apocalyptic number.

It is an amenable number.

663296861 is a deficient number, since it is larger than the sum of its proper divisors (1).

663296861 is an equidigital number, since it uses as much as digits as its factorization.

663296861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 47.

The square root of 663296861 is about 25754.5502969864. The cubic root of 663296861 is about 872.1060795428.

The spelling of 663296861 in words is "six hundred sixty-three million, two hundred ninety-six thousand, eight hundred sixty-one".