18149580569 has 2 divisors, whose sum is σ = 18149580570. Its totient is φ = 18149580568.

The previous prime is 18149580557. The next prime is 18149580587. The reversal of 18149580569 is 96508594181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18006419344 + 143161225 = 134188^2 + 11965^2 .

It is a cyclic number.

It is not a de Polignac number, because 18149580569 - 2²⁰ = 18148531993 is a prime.

It is a super-2 number, since 2×18149580569² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18149580529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9074790284 + 9074790285.

It is an arithmetic number, because the mean of its divisors is an integer number (9074790285).

Almost surely, 2^18149580569 is an apocalyptic number.

It is an amenable number.

18149580569 is a deficient number, since it is larger than the sum of its proper divisors (1).

18149580569 is an equidigital number, since it uses as much as digits as its factorization.

18149580569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3110400, while the sum is 56.

The spelling of 18149580569 in words is "eighteen billion, one hundred forty-nine million, five hundred eighty thousand, five hundred sixty-nine".