18381267126244 has 243 divisors, whose sum is σ = 38154034983771. Its totient is φ = 7741903466880.

The previous prime is 18381267126241. The next prime is 18381267126367. The reversal of 18381267126244 is 44262176218381.

The square root of 18381267126244 is 4287338.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 12599589168100 + 5781677958144 = 3549590^2 + 2404512^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18381267126241) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 80267541922 + ... + 80267542150.

Almost surely, 2^{18381267126244} is an apocalyptic number.

18381267126244 is the 4287338-th square number.

It is an amenable number.

18381267126244 is an abundant number, since it is smaller than the sum of its proper divisors (19772767857527).

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

18381267126244 is a wasteful number, since it uses less digits than its factorization.

18381267126244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604 (or 302 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 55.

The spelling of 18381267126244 in words is "eighteen trillion, three hundred eighty-one billion, two hundred sixty-seven million, one hundred twenty-six thousand, two hundred forty-four".