18159320349 has 24 divisors (see below), whose sum is σ = 26604821880. Its totient is φ = 11933471232.

The previous prime is 18159320329. The next prime is 18159320353. The reversal of 18159320349 is 94302395181.

It is a happy number.

18159320349 is a `hidden beast` number, since 1 + 8 + 1 + 593 + 20 + 34 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3140817849 + 15018502500 = 56043^2 + 122550^2 .

It is not a de Polignac number, because 18159320349 - 2²³ = 18150931741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18159320329) 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 in 23 ways as a sum of consecutive naturals, for example, 1289257 + ... + 1303265.

It is an arithmetic number, because the mean of its divisors is an integer number (1108534245).

Almost surely, 2^18159320349 is an apocalyptic number.

It is an amenable number.

18159320349 is a deficient number, since it is larger than the sum of its proper divisors (8445501531).

18159320349 is a wasteful number, since it uses less digits than its factorization.

18159320349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16061 (or 16058 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 18159320349 in words is "eighteen billion, one hundred fifty-nine million, three hundred twenty thousand, three hundred forty-nine".