18444627722 has 8 divisors (see below), whose sum is σ = 27911782116. Its totient is φ = 9140700352.

The previous prime is 18444627671. The next prime is 18444627737. The reversal of 18444627722 is 22772644481.

It is a Cunningham number, because it is equal to 135811²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 18444627721 + 1 = 135811^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40806473 + ... + 40806924.

Almost surely, 2^18444627722 is an apocalyptic number.

18444627722 is a deficient number, since it is larger than the sum of its proper divisors (9467154394).

18444627722 is a wasteful number, since it uses less digits than its factorization.

18444627722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81613512.

The product of its digits is 1204224, while the sum is 47.

The spelling of 18444627722 in words is "eighteen billion, four hundred forty-four million, six hundred twenty-seven thousand, seven hundred twenty-two".