18319162861 has 4 divisors (see below), whose sum is σ = 18354324924. Its totient is φ = 18284000800.

The previous prime is 18319162837. The next prime is 18319162903. The reversal of 18319162861 is 16826191381.

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 3661460100 + 14657702761 = 60510^2 + 121069^2 .

It is a cyclic number.

It is not a de Polignac number, because 18319162861 - 2²¹ = 18317065709 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 (18319160861) by changing a digit.

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, 17580250 + ... + 17581291.

It is an arithmetic number, because the mean of its divisors is an integer number (4588581231).

Almost surely, 2^18319162861 is an apocalyptic number.

It is an amenable number.

18319162861 is a deficient number, since it is larger than the sum of its proper divisors (35162063).

18319162861 is an equidigital number, since it uses as much as digits as its factorization.

18319162861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35162062.

The product of its digits is 124416, while the sum is 46.

The spelling of 18319162861 in words is "eighteen billion, three hundred nineteen million, one hundred sixty-two thousand, eight hundred sixty-one".