18000033000081 has 64 divisors (see below), whose sum is σ = 29355766917120. Its totient is φ = 9668762588160.

The previous prime is 18000033000077. The next prime is 18000033000091.

18000033000081 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18000033000081 - 2² = 18000033000077 is a prime.

It is a super-2 number, since 2×18000033000081² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18000033000071) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3275986 + ... + 6836091.

It is an arithmetic number, because the mean of its divisors is an integer number (458683858080).

Almost surely, 2^{18000033000081} is an apocalyptic number.

18000033000081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18000033000081 is a deficient number, since it is larger than the sum of its proper divisors (11355733917039).

18000033000081 is a wasteful number, since it uses less digits than its factorization.

18000033000081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10112294.

The product of its (nonzero) digits is 576, while the sum is 24.

It can be divided in two parts, 1800003 and 3000081, that added together give a palindrome (4800084).

The spelling of 18000033000081 in words is "eighteen trillion, thirty-three million, eighty-one", and thus it is an aban number and an uban number.