18281872818231 has 32 divisors (see below), whose sum is σ = 27312469536768. Its totient is φ = 10779693114240.

The previous prime is 18281872818211. The next prime is 18281872818311. The reversal of 18281872818231 is 13281827818281.

It is not a de Polignac number, because 18281872818231 - 2¹⁰ = 18281872817207 is a prime.

It is a super-2 number, since 2×18281872818231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18281872818211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16739265 + ... + 17797941.

It is an arithmetic number, because the mean of its divisors is an integer number (853514673024).

Almost surely, 2^{18281872818231} is an apocalyptic number.

18281872818231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18281872818231 is a deficient number, since it is larger than the sum of its proper divisors (9030596718537).

18281872818231 is a wasteful number, since it uses less digits than its factorization.

18281872818231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072871.

The product of its digits is 5505024, while the sum is 60.

The spelling of 18281872818231 in words is "eighteen trillion, two hundred eighty-one billion, eight hundred seventy-two million, eight hundred eighteen thousand, two hundred thirty-one".