18156785315 has 16 divisors (see below), whose sum is σ = 23505082848. Its totient is φ = 13413044736.

The previous prime is 18156785293. The next prime is 18156785329. The reversal of 18156785315 is 51358765181.

It is a cyclic number.

It is not a de Polignac number, because 18156785315 - 2¹² = 18156781219 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 2010677 + ... + 2019686.

It is an arithmetic number, because the mean of its divisors is an integer number (1469067678).

Almost surely, 2^18156785315 is an apocalyptic number.

18156785315 is a deficient number, since it is larger than the sum of its proper divisors (5348297533).

18156785315 is a wasteful number, since it uses less digits than its factorization.

18156785315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4030438.

The product of its digits is 1008000, while the sum is 50.

The spelling of 18156785315 in words is "eighteen billion, one hundred fifty-six million, seven hundred eighty-five thousand, three hundred fifteen".