18159224738 has 6 divisors (see below), whose sum is σ = 27239122971. Its totient is φ = 9079517082.

The previous prime is 18159224729. The next prime is 18159224773. The reversal of 18159224738 is 83742295181.

It can be written as a sum of positive squares in only one way, i.e., 9079612369 + 9079612369 = 95287^2 + 95287^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=95287.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 142931 + ... + 238217.

Almost surely, 2^18159224738 is an apocalyptic number.

18159224738 is a deficient number, since it is larger than the sum of its proper divisors (9079898233).

18159224738 is an frugal number, since it uses more digits than its factorization.

18159224738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190576 (or 95289 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

Multiplying 18159224738 by its sum of digits (50), we get a square (907961236900 = 952870²).

The spelling of 18159224738 in words is "eighteen billion, one hundred fifty-nine million, two hundred twenty-four thousand, seven hundred thirty-eight".