18474191317 has 4 divisors (see below), whose sum is σ = 18708041920. Its totient is φ = 18240340716.

The previous prime is 18474191303. The next prime is 18474191327. The reversal of 18474191317 is 71319147481.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71319147481 = 3923 ⋅18179747.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18474191317 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 (18474191327) 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, 116925183 + ... + 116925340.

It is an arithmetic number, because the mean of its divisors is an integer number (4677010480).

Almost surely, 2^18474191317 is an apocalyptic number.

It is an amenable number.

18474191317 is a deficient number, since it is larger than the sum of its proper divisors (233850603).

18474191317 is an equidigital number, since it uses as much as digits as its factorization.

18474191317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233850602.

The product of its digits is 169344, while the sum is 46.

The spelling of 18474191317 in words is "eighteen billion, four hundred seventy-four million, one hundred ninety-one thousand, three hundred seventeen".