18854844259 has 2 divisors, whose sum is σ = 18854844260. Its totient is φ = 18854844258.

The previous prime is 18854844257. The next prime is 18854844301. The reversal of 18854844259 is 95244845881.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18854844259 - 2¹ = 18854844257 is a prime.

It is a super-2 number, since 2×18854844259² (a number of 21 digits) contains 22 as substring.

Together with 18854844257, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18854844257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9427422129 + 9427422130.

It is an arithmetic number, because the mean of its divisors is an integer number (9427422130).

Almost surely, 2^18854844259 is an apocalyptic number.

18854844259 is a deficient number, since it is larger than the sum of its proper divisors (1).

18854844259 is an equidigital number, since it uses as much as digits as its factorization.

18854844259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14745600, while the sum is 58.

The spelling of 18854844259 in words is "eighteen billion, eight hundred fifty-four million, eight hundred forty-four thousand, two hundred fifty-nine".