18383746638211 has 4 divisors (see below), whose sum is σ = 18546434661672. Its totient is φ = 18221058614752.

The previous prime is 18383746638163. The next prime is 18383746638253. The reversal of 18383746638211 is 11283664738381.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18383746638211 - 2¹¹ = 18383746636163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18383746638211.

It is not an unprimeable number, because it can be changed into a prime (18383746608211) 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, 81344011561 + ... + 81344011786.

It is an arithmetic number, because the mean of its divisors is an integer number (4636608665418).

Almost surely, 2^{18383746638211} is an apocalyptic number.

18383746638211 is a deficient number, since it is larger than the sum of its proper divisors (162688023461).

18383746638211 is a wasteful number, since it uses less digits than its factorization.

18383746638211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162688023460.

The product of its digits is 27869184, while the sum is 61.

The spelling of 18383746638211 in words is "eighteen trillion, three hundred eighty-three billion, seven hundred forty-six million, six hundred thirty-eight thousand, two hundred eleven".