18444833844481 has 4 divisors (see below), whose sum is σ = 20121636921264. Its totient is φ = 16768030767700.

The previous prime is 18444833844343. The next prime is 18444833844517.

18444833844481 is nontrivially palindromic in base 10.

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 a de Polignac number, because none of the positive numbers 2^k-18444833844481 is a prime.

It is a super-2 number, since 2×18444833844481² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18444833844881) 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, 838401538375 + ... + 838401538396.

It is an arithmetic number, because the mean of its divisors is an integer number (5030409230316).

Almost surely, 2^{18444833844481} is an apocalyptic number.

18444833844481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18444833844481 is a deficient number, since it is larger than the sum of its proper divisors (1676803076783).

18444833844481 is a wasteful number, since it uses less digits than its factorization.

18444833844481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676803076782.

The product of its digits is 150994944, while the sum is 64.

The spelling of 18444833844481 in words is "eighteen trillion, four hundred forty-four billion, eight hundred thirty-three million, eight hundred forty-four thousand, four hundred eighty-one".