18159515873 has 2 divisors, whose sum is σ = 18159515874. Its totient is φ = 18159515872.

The previous prime is 18159515851. The next prime is 18159515879. The reversal of 18159515873 is 37851595181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18032998369 + 126517504 = 134287^2 + 11248^2 .

It is a cyclic number.

It is not a de Polignac number, because 18159515873 - 2²⁶ = 18092407009 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 (18159515879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9079757936 + 9079757937.

It is an arithmetic number, because the mean of its divisors is an integer number (9079757937).

Almost surely, 2^18159515873 is an apocalyptic number.

It is an amenable number.

18159515873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18159515873 is an equidigital number, since it uses as much as digits as its factorization.

18159515873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512000, while the sum is 53.

The spelling of 18159515873 in words is "eighteen billion, one hundred fifty-nine million, five hundred fifteen thousand, eight hundred seventy-three".