18814215911 has 4 divisors (see below), whose sum is σ = 19920934512. Its totient is φ = 17707497312.

The previous prime is 18814215841. The next prime is 18814215919. The reversal of 18814215911 is 11951241881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18814215911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18814215919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553359275 + ... + 553359308.

It is an arithmetic number, because the mean of its divisors is an integer number (4980233628).

Almost surely, 2^18814215911 is an apocalyptic number.

18814215911 is a deficient number, since it is larger than the sum of its proper divisors (1106718601).

18814215911 is a wasteful number, since it uses less digits than its factorization.

18814215911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106718600.

The product of its digits is 23040, while the sum is 41.

The spelling of 18814215911 in words is "eighteen billion, eight hundred fourteen million, two hundred fifteen thousand, nine hundred eleven".