18226713555664 has 80 divisors (see below), whose sum is σ = 38792117145600. Its totient is φ = 8257688892288.

The previous prime is 18226713555653. The next prime is 18226713555667. The reversal of 18226713555664 is 46655531762281.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18226713555667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96948057 + ... + 97135879.

It is an arithmetic number, because the mean of its divisors is an integer number (484901464320).

Almost surely, 2^{18226713555664} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18226713555664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19396058572800).

18226713555664 is an abundant number, since it is smaller than the sum of its proper divisors (20565403589936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18226713555664 is a wasteful number, since it uses less digits than its factorization.

18226713555664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201752 (or 201746 counting only the distinct ones).

The product of its digits is 72576000, while the sum is 61.

The spelling of 18226713555664 in words is "eighteen trillion, two hundred twenty-six billion, seven hundred thirteen million, five hundred fifty-five thousand, six hundred sixty-four".