18065569 has 2 divisors, whose sum is σ = 18065570. Its totient is φ = 18065568.

The previous prime is 18065533. The next prime is 18065573. The reversal of 18065569 is 96556081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9684544 + 8381025 = 3112^2 + 2895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18065569 is a prime.

It is a super-2 number, since 2×18065569² = 652729566587522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18065669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9032784 + 9032785.

It is an arithmetic number, because the mean of its divisors is an integer number (9032785).

Almost surely, 2^18065569 is an apocalyptic number.

It is an amenable number.

18065569 is a deficient number, since it is larger than the sum of its proper divisors (1).

18065569 is an equidigital number, since it uses as much as digits as its factorization.

18065569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 40.

The square root of 18065569 is about 4250.3610434880. The cubic root of 18065569 is about 262.3919749011.

The spelling of 18065569 in words is "eighteen million, sixty-five thousand, five hundred sixty-nine".