663444863 has 2 divisors, whose sum is σ = 663444864. Its totient is φ = 663444862.

The previous prime is 663444853. The next prime is 663444871. The reversal of 663444863 is 368444366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663444863 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663444853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331722431 + 331722432.

It is an arithmetic number, because the mean of its divisors is an integer number (331722432).

Almost surely, 2^663444863 is an apocalyptic number.

663444863 is a deficient number, since it is larger than the sum of its proper divisors (1).

663444863 is an equidigital number, since it uses as much as digits as its factorization.

663444863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 44.

The square root of 663444863 is about 25757.4234542200. The cubic root of 663444863 is about 872.1709393126.

The spelling of 663444863 in words is "six hundred sixty-three million, four hundred forty-four thousand, eight hundred sixty-three".