18165211279 has 4 divisors (see below), whose sum is σ = 18551705184. Its totient is φ = 17778717376.

The previous prime is 18165211241. The next prime is 18165211301. The reversal of 18165211279 is 97211256181.

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

It is a cyclic number.

It is not a de Polignac number, because 18165211279 - 2²⁷ = 18030993551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18165211219) 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 3 ways as a sum of consecutive naturals, for example, 193246882 + ... + 193246975.

It is an arithmetic number, because the mean of its divisors is an integer number (4637926296).

Almost surely, 2^18165211279 is an apocalyptic number.

18165211279 is a deficient number, since it is larger than the sum of its proper divisors (386493905).

18165211279 is an equidigital number, since it uses as much as digits as its factorization.

18165211279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386493904.

The product of its digits is 60480, while the sum is 43.

The spelling of 18165211279 in words is "eighteen billion, one hundred sixty-five million, two hundred eleven thousand, two hundred seventy-nine".