18156484529 has 2 divisors, whose sum is σ = 18156484530. Its totient is φ = 18156484528.

The previous prime is 18156484513. The next prime is 18156484543. The reversal of 18156484529 is 92548465181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13001244529 + 5155240000 = 114023^2 + 71800^2 .

It is a cyclic number.

It is not a de Polignac number, because 18156484529 - 2⁴ = 18156484513 is a prime.

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 (18156484559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9078242264 + 9078242265.

It is an arithmetic number, because the mean of its divisors is an integer number (9078242265).

Almost surely, 2^18156484529 is an apocalyptic number.

It is an amenable number.

18156484529 is a deficient number, since it is larger than the sum of its proper divisors (1).

18156484529 is an equidigital number, since it uses as much as digits as its factorization.

18156484529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2764800, while the sum is 53.

The spelling of 18156484529 in words is "eighteen billion, one hundred fifty-six million, four hundred eighty-four thousand, five hundred twenty-nine".