18333834989 has 8 divisors (see below), whose sum is σ = 18516531000. Its totient is φ = 18151402752.

The previous prime is 18333834947. The next prime is 18333834991. The reversal of 18333834989 is 98943833381.

It can be written as a sum of positive squares in 4 ways, for example, as 6832344964 + 11501490025 = 82658^2 + 107245^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18333834989 - 2²⁸ = 18065399533 is a prime.

It is a super-2 number, since 2×18333834989² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18333834689) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75257 + ... + 205745.

It is an arithmetic number, because the mean of its divisors is an integer number (2314566375).

Almost surely, 2^18333834989 is an apocalyptic number.

It is an amenable number.

18333834989 is a deficient number, since it is larger than the sum of its proper divisors (182696011).

18333834989 is a wasteful number, since it uses less digits than its factorization.

18333834989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131887.

The product of its digits is 13436928, while the sum is 59.

The spelling of 18333834989 in words is "eighteen billion, three hundred thirty-three million, eight hundred thirty-four thousand, nine hundred eighty-nine".