18001870243 has 12 divisors (see below), whose sum is σ = 20946130632. Its totient is φ = 15426358080.

The previous prime is 18001870219. The next prime is 18001870261. The reversal of 18001870243 is 34207810081.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-18001870243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18001870199 and 18001870208.

It is not an unprimeable number, because it can be changed into a prime (18001870273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164496 + ... + 251122.

It is an arithmetic number, because the mean of its divisors is an integer number (1745510886).

Almost surely, 2^18001870243 is an apocalyptic number.

18001870243 is a deficient number, since it is larger than the sum of its proper divisors (2944260389).

18001870243 is an equidigital number, since it uses as much as digits as its factorization.

18001870243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90882 (or 90875 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The spelling of 18001870243 in words is "eighteen billion, one million, eight hundred seventy thousand, two hundred forty-three".