263645663 has 2 divisors, whose sum is σ = 263645664. Its totient is φ = 263645662.

The previous prime is 263645659. The next prime is 263645687. The reversal of 263645663 is 366546362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 263645663 - 2² = 263645659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 263645663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263645623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131822831 + 131822832.

It is an arithmetic number, because the mean of its divisors is an integer number (131822832).

Almost surely, 2^263645663 is an apocalyptic number.

263645663 is a deficient number, since it is larger than the sum of its proper divisors (1).

263645663 is an equidigital number, since it uses as much as digits as its factorization.

263645663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 41.

The square root of 263645663 is about 16237.1691806177. The cubic root of 263645663 is about 641.2197304038.

The spelling of 263645663 in words is "two hundred sixty-three million, six hundred forty-five thousand, six hundred sixty-three".