18326086861 has 4 divisors (see below), whose sum is σ = 18346204224. Its totient is φ = 18305969500.

The previous prime is 18326086771. The next prime is 18326086879. The reversal of 18326086861 is 16868062381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18326086861 - 2¹³ = 18326078669 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 (18326086061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10057315 + ... + 10059136.

It is an arithmetic number, because the mean of its divisors is an integer number (4586551056).

Almost surely, 2^18326086861 is an apocalyptic number.

It is an amenable number.

18326086861 is a deficient number, since it is larger than the sum of its proper divisors (20117363).

18326086861 is an equidigital number, since it uses as much as digits as its factorization.

18326086861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20117362.

The product of its (nonzero) digits is 663552, while the sum is 49.

The spelling of 18326086861 in words is "eighteen billion, three hundred twenty-six million, eighty-six thousand, eight hundred sixty-one".