18495198719 has 4 divisors (see below), whose sum is σ = 18798398760. Its totient is φ = 18191998680.

The previous prime is 18495198707. The next prime is 18495198763. The reversal of 18495198719 is 91789159481.

It is a happy number.

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-18495198719 is a prime.

It is a super-2 number, since 2×18495198719² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18495198019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151599929 + ... + 151600050.

It is an arithmetic number, because the mean of its divisors is an integer number (4699599690).

Almost surely, 2^18495198719 is an apocalyptic number.

18495198719 is a deficient number, since it is larger than the sum of its proper divisors (303200041).

18495198719 is an equidigital number, since it uses as much as digits as its factorization.

18495198719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303200040.

The product of its digits is 6531840, while the sum is 62.

The spelling of 18495198719 in words is "eighteen billion, four hundred ninety-five million, one hundred ninety-eight thousand, seven hundred nineteen".