18261800223 has 4 divisors (see below), whose sum is σ = 24349066968. Its totient is φ = 12174533480.

The previous prime is 18261800213. The next prime is 18261800251. The reversal of 18261800223 is 32200816281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32200816281 = 3 ⋅10733605427.

It is a cyclic number.

It is not a de Polignac number, because 18261800223 - 2⁵ = 18261800191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18261800213) 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, 3043633368 + ... + 3043633373.

It is an arithmetic number, because the mean of its divisors is an integer number (6087266742).

Almost surely, 2^18261800223 is an apocalyptic number.

18261800223 is a deficient number, since it is larger than the sum of its proper divisors (6087266745).

18261800223 is an equidigital number, since it uses as much as digits as its factorization.

18261800223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6087266744.

The product of its (nonzero) digits is 9216, while the sum is 33.

The spelling of 18261800223 in words is "eighteen billion, two hundred sixty-one million, eight hundred thousand, two hundred twenty-three".