18216595722893 has 4 divisors (see below), whose sum is σ = 18216607112028. Its totient is φ = 18216584333760.

The previous prime is 18216595722889. The next prime is 18216595722937. The reversal of 18216595722893 is 39822759561281.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8197009493764 + 10019586229129 = 2863042^2 + 3165373^2 .

It is a cyclic number.

It is not a de Polignac number, because 18216595722893 - 2² = 18216595722889 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 (18216595722823) 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, 2807438 + ... + 6656943.

It is an arithmetic number, because the mean of its divisors is an integer number (4554151778007).

Almost surely, 2^{18216595722893} is an apocalyptic number.

It is an amenable number.

18216595722893 is a deficient number, since it is larger than the sum of its proper divisors (11389135).

18216595722893 is an equidigital number, since it uses as much as digits as its factorization.

18216595722893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11389134.

The product of its digits is 130636800, while the sum is 68.

The spelling of 18216595722893 in words is "eighteen trillion, two hundred sixteen billion, five hundred ninety-five million, seven hundred twenty-two thousand, eight hundred ninety-three".