18381267126243 has 24 divisors (see below), whose sum is σ = 30344132026208. Its totient is φ = 10503424420992.

The previous prime is 18381267126241. The next prime is 18381267126367. The reversal of 18381267126243 is 34262176218381.

18381267126243 is a `hidden beast` number, since 1 + 8 + 3 + 8 + 1 + 2 + 6 + 7 + 1 + 2 + 624 + 3 = 666.

It is a Cunningham number, because it is equal to 4287338²-1.

It is not a de Polignac number, because 18381267126243 - 2¹ = 18381267126241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18381267126243.

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 23 ways as a sum of consecutive naturals, for example, 2143671 + ... + 6431007.

Almost surely, 2^{18381267126243} is an apocalyptic number.

18381267126243 is a deficient number, since it is larger than the sum of its proper divisors (11962864899965).

18381267126243 is a wasteful number, since it uses less digits than its factorization.

18381267126243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4355403 (or 4355400 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The spelling of 18381267126243 in words is "eighteen trillion, three hundred eighty-one billion, two hundred sixty-seven million, one hundred twenty-six thousand, two hundred forty-three".