18505371347 has 4 divisors (see below), whose sum is σ = 19479338280. Its totient is φ = 17531404416.

The previous prime is 18505371319. The next prime is 18505371359. The reversal of 18505371347 is 74317350581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74317350581 = 137 ⋅542462413.

It is a cyclic number.

It is not a de Polignac number, because 18505371347 - 2¹⁴ = 18505354963 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18505371298 and 18505371307.

It is not an unprimeable number, because it can be changed into a prime (18505371307) 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, 486983438 + ... + 486983475.

It is an arithmetic number, because the mean of its divisors is an integer number (4869834570).

Almost surely, 2^18505371347 is an apocalyptic number.

18505371347 is a deficient number, since it is larger than the sum of its proper divisors (973966933).

18505371347 is an equidigital number, since it uses as much as digits as its factorization.

18505371347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 973966932.

The product of its (nonzero) digits is 352800, while the sum is 44.

The spelling of 18505371347 in words is "eighteen billion, five hundred five million, three hundred seventy-one thousand, three hundred forty-seven".