18217645736344 has 32 divisors (see below), whose sum is σ = 35456736427200. Its totient is φ = 8768870277120.

The previous prime is 18217645736237. The next prime is 18217645736351. The reversal of 18217645736344 is 44363754671281.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397117929 + ... + 397163800.

It is an arithmetic number, because the mean of its divisors is an integer number (1108023013350).

Almost surely, 2^{18217645736344} is an apocalyptic number.

It is an amenable number.

18217645736344 is a deficient number, since it is larger than the sum of its proper divisors (17239090690856).

18217645736344 is a wasteful number, since it uses less digits than its factorization.

18217645736344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794281843 (or 794281839 counting only the distinct ones).

The product of its digits is 81285120, while the sum is 61.

The spelling of 18217645736344 in words is "eighteen trillion, two hundred seventeen billion, six hundred forty-five million, seven hundred thirty-six thousand, three hundred forty-four".