18263563 has 2 divisors, whose sum is σ = 18263564. Its totient is φ = 18263562.

The previous prime is 18263551. The next prime is 18263599. The reversal of 18263563 is 36536281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18263563 - 2⁹ = 18263051 is a prime.

It is not a weakly prime, because it can be changed into another prime (18263263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9131781 + 9131782.

It is an arithmetic number, because the mean of its divisors is an integer number (9131782).

Almost surely, 2^18263563 is an apocalyptic number.

18263563 is a deficient number, since it is larger than the sum of its proper divisors (1).

18263563 is an equidigital number, since it uses as much as digits as its factorization.

18263563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 18263563 is about 4273.5890069121. The cubic root of 18263563 is about 263.3470770302.

The spelling of 18263563 in words is "eighteen million, two hundred sixty-three thousand, five hundred sixty-three".