18033233081 has 4 divisors (see below), whose sum is σ = 18052479732. Its totient is φ = 18013986432.

The previous prime is 18033233069. The next prime is 18033233083.

18033233081 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8824911481 + 9208321600 = 93941^2 + 95960^2 .

It is a cyclic number.

It is not a de Polignac number, because 18033233081 - 2⁶ = 18033233017 is a prime.

It is a super-2 number, since 2×18033233081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18033233083) 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, 9621920 + ... + 9623793.

It is an arithmetic number, because the mean of its divisors is an integer number (4513119933).

Almost surely, 2^18033233081 is an apocalyptic number.

It is an amenable number.

18033233081 is a deficient number, since it is larger than the sum of its proper divisors (19246651).

18033233081 is an equidigital number, since it uses as much as digits as its factorization.

18033233081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19246650.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 18033233081 in words is "eighteen billion, thirty-three million, two hundred thirty-three thousand, eighty-one".