18855914894 has 4 divisors (see below), whose sum is σ = 28283872344. Its totient is φ = 9427957446.

The previous prime is 18855914881. The next prime is 18855914897. The reversal of 18855914894 is 49841955881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49841955881 = 36073 ⋅1381697.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18855914897) 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, 4713978722 + ... + 4713978725.

It is an arithmetic number, because the mean of its divisors is an integer number (7070968086).

Almost surely, 2^18855914894 is an apocalyptic number.

18855914894 is a deficient number, since it is larger than the sum of its proper divisors (9427957450).

18855914894 is an equidigital number, since it uses as much as digits as its factorization.

18855914894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9427957449.

The product of its digits is 16588800, while the sum is 62.

The spelling of 18855914894 in words is "eighteen billion, eight hundred fifty-five million, nine hundred fourteen thousand, eight hundred ninety-four".