663923567 has 2 divisors, whose sum is σ = 663923568. Its totient is φ = 663923566.

The previous prime is 663923563. The next prime is 663923599. The reversal of 663923567 is 765329366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663923567 - 2² = 663923563 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663923563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331961783 + 331961784.

It is an arithmetic number, because the mean of its divisors is an integer number (331961784).

Almost surely, 2^663923567 is an apocalyptic number.

663923567 is a deficient number, since it is larger than the sum of its proper divisors (1).

663923567 is an equidigital number, since it uses as much as digits as its factorization.

663923567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1224720, while the sum is 47.

The square root of 663923567 is about 25766.7143229400. The cubic root of 663923567 is about 872.3806584937.

The spelling of 663923567 in words is "six hundred sixty-three million, nine hundred twenty-three thousand, five hundred sixty-seven".