18198563 has 2 divisors, whose sum is σ = 18198564. Its totient is φ = 18198562.

The previous prime is 18198553. The next prime is 18198571. The reversal of 18198563 is 36589181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18198563 - 2⁸ = 18198307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18198563.

It is not a weakly prime, because it can be changed into another prime (18198533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9099281 + 9099282.

It is an arithmetic number, because the mean of its divisors is an integer number (9099282).

Almost surely, 2^18198563 is an apocalyptic number.

18198563 is a deficient number, since it is larger than the sum of its proper divisors (1).

18198563 is an equidigital number, since it uses as much as digits as its factorization.

18198563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 18198563 is about 4265.9773792180. The cubic root of 18198563 is about 263.0342883485.

The spelling of 18198563 in words is "eighteen million, one hundred ninety-eight thousand, five hundred sixty-three".