18195563 has 2 divisors, whose sum is σ = 18195564. Its totient is φ = 18195562.

The previous prime is 18195547. The next prime is 18195571. The reversal of 18195563 is 36559181.

It is a strong prime.

It is an emirp because it is prime and its reverse (36559181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18195563 - 2⁴ = 18195547 is a prime.

It is not a weakly prime, because it can be changed into another prime (18194563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9097781 + 9097782.

It is an arithmetic number, because the mean of its divisors is an integer number (9097782).

Almost surely, 2^18195563 is an apocalyptic number.

18195563 is a deficient number, since it is larger than the sum of its proper divisors (1).

18195563 is an equidigital number, since it uses as much as digits as its factorization.

18195563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 38.

The square root of 18195563 is about 4265.6257454212. The cubic root of 18195563 is about 263.0198339796.

The spelling of 18195563 in words is "eighteen million, one hundred ninety-five thousand, five hundred sixty-three".