18397072333 has 4 divisors (see below), whose sum is σ = 18403671420. Its totient is φ = 18390473248.

The previous prime is 18397072279. The next prime is 18397072361. The reversal of 18397072333 is 33327079381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33327079381 = 587 ⋅56775263.

It can be written as a sum of positive squares in 2 ways, for example, as 15792194889 + 2604877444 = 125667^2 + 51038^2 .

It is a cyclic number.

It is not a de Polignac number, because 18397072333 - 2¹³ = 18397064141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18397072363) 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, 3295360 + ... + 3300937.

It is an arithmetic number, because the mean of its divisors is an integer number (4600917855).

Almost surely, 2^18397072333 is an apocalyptic number.

It is an amenable number.

18397072333 is a deficient number, since it is larger than the sum of its proper divisors (6599087).

18397072333 is an equidigital number, since it uses as much as digits as its factorization.

18397072333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6599086.

The product of its (nonzero) digits is 571536, while the sum is 46.

The spelling of 18397072333 in words is "eighteen billion, three hundred ninety-seven million, seventy-two thousand, three hundred thirty-three".