18159515879 has 2 divisors, whose sum is σ = 18159515880. Its totient is φ = 18159515878.

The previous prime is 18159515873. The next prime is 18159515903. The reversal of 18159515879 is 97851595181.

It is a weak prime.

It is an emirp because it is prime and its reverse (97851595181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18159515879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18159515873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9079757939 + 9079757940.

It is an arithmetic number, because the mean of its divisors is an integer number (9079757940).

Almost surely, 2^18159515879 is an apocalyptic number.

18159515879 is a deficient number, since it is larger than the sum of its proper divisors (1).

18159515879 is an equidigital number, since it uses as much as digits as its factorization.

18159515879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536000, while the sum is 59.

The spelling of 18159515879 in words is "eighteen billion, one hundred fifty-nine million, five hundred fifteen thousand, eight hundred seventy-nine".