18572563 has 2 divisors, whose sum is σ = 18572564. Its totient is φ = 18572562.

The previous prime is 18572537. The next prime is 18572581. The reversal of 18572563 is 36527581.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18572563 - 2⁵ = 18572531 is a prime.

It is not a weakly prime, because it can be changed into another prime (18572513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9286281 + 9286282.

It is an arithmetic number, because the mean of its divisors is an integer number (9286282).

Almost surely, 2^18572563 is an apocalyptic number.

18572563 is a deficient number, since it is larger than the sum of its proper divisors (1).

18572563 is an equidigital number, since it uses as much as digits as its factorization.

18572563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 18572563 is about 4309.5896556401. The cubic root of 18572563 is about 264.8239628296.

The spelling of 18572563 in words is "eighteen million, five hundred seventy-two thousand, five hundred sixty-three".