18156308915 has 8 divisors (see below), whose sum is σ = 22251136320. Its totient is φ = 14216003392.

The previous prime is 18156308903. The next prime is 18156308917. The reversal of 18156308915 is 51980365181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18156308915 - 2⁴ = 18156308899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 18156308915.

It is not an unprimeable number, because it can be changed into a prime (18156308917) 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 7 ways as a sum of consecutive naturals, for example, 38630210 + ... + 38630679.

It is an arithmetic number, because the mean of its divisors is an integer number (2781392040).

Almost surely, 2^18156308915 is an apocalyptic number.

18156308915 is a deficient number, since it is larger than the sum of its proper divisors (4094827405).

18156308915 is an equidigital number, since it uses as much as digits as its factorization.

18156308915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77260941.

The product of its (nonzero) digits is 259200, while the sum is 47.

The spelling of 18156308915 in words is "eighteen billion, one hundred fifty-six million, three hundred eight thousand, nine hundred fifteen".