18809349547 has 4 divisors (see below), whose sum is σ = 18876287016. Its totient is φ = 18742412080.

The previous prime is 18809349523. The next prime is 18809349571. The reversal of 18809349547 is 74594390881.

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

It is an interprime number because it is at equal distance from previous prime (18809349523) and next prime (18809349571).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18809349547 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18809349491 and 18809349500.

It is not an unprimeable number, because it can be changed into a prime (18809349947) 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 in 3 ways as a sum of consecutive naturals, for example, 33468313 + ... + 33468874.

It is an arithmetic number, because the mean of its divisors is an integer number (4719071754).

Almost surely, 2^18809349547 is an apocalyptic number.

18809349547 is a deficient number, since it is larger than the sum of its proper divisors (66937469).

18809349547 is an equidigital number, since it uses as much as digits as its factorization.

18809349547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66937468.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 18809349547 in words is "eighteen billion, eight hundred nine million, three hundred forty-nine thousand, five hundred forty-seven".