18917414249 has 4 divisors (see below), whose sum is σ = 18919496064. Its totient is φ = 18915332436.

The previous prime is 18917414221. The next prime is 18917414267. The reversal of 18917414249 is 94241471981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18917414249 - 2⁸ = 18917413993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18917414197 and 18917414206.

It is not an unprimeable number, because it can be changed into a prime (18917414149) 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, 1027217 + ... + 1045470.

It is an arithmetic number, because the mean of its divisors is an integer number (4729874016).

Almost surely, 2^18917414249 is an apocalyptic number.

It is an amenable number.

18917414249 is a deficient number, since it is larger than the sum of its proper divisors (2081815).

18917414249 is an equidigital number, since it uses as much as digits as its factorization.

18917414249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081814.

The product of its digits is 580608, while the sum is 50.

The spelling of 18917414249 in words is "eighteen billion, nine hundred seventeen million, four hundred fourteen thousand, two hundred forty-nine".