18215026243 has 2 divisors, whose sum is σ = 18215026244. Its totient is φ = 18215026242.

The previous prime is 18215026241. The next prime is 18215026279. The reversal of 18215026243 is 34262051281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18215026243 - 2¹ = 18215026241 is a prime.

Together with 18215026241, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18215026199 and 18215026208.

It is not a weakly prime, because it can be changed into another prime (18215026241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9107513121 + 9107513122.

It is an arithmetic number, because the mean of its divisors is an integer number (9107513122).

Almost surely, 2^18215026243 is an apocalyptic number.

18215026243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18215026243 is an equidigital number, since it uses as much as digits as its factorization.

18215026243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 18215026243 in words is "eighteen billion, two hundred fifteen million, twenty-six thousand, two hundred forty-three".