18016402385 has 4 divisors (see below), whose sum is σ = 21619682868. Its totient is φ = 14413121904.

The previous prime is 18016402363. The next prime is 18016402403. The reversal of 18016402385 is 58320461081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11784405136 + 6231997249 = 108556^2 + 78943^2 .

It is a cyclic number.

It is not a de Polignac number, because 18016402385 - 2³⁰ = 16942660561 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1801640234 + ... + 1801640243.

It is an arithmetic number, because the mean of its divisors is an integer number (5404920717).

Almost surely, 2^18016402385 is an apocalyptic number.

It is an amenable number.

18016402385 is a deficient number, since it is larger than the sum of its proper divisors (3603280483).

18016402385 is an equidigital number, since it uses as much as digits as its factorization.

18016402385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3603280482.

The product of its (nonzero) digits is 46080, while the sum is 38.

The spelling of 18016402385 in words is "eighteen billion, sixteen million, four hundred two thousand, three hundred eighty-five".