18474327947847 has 32 divisors (see below), whose sum is σ = 25179513375744. Its totient is φ = 12043163216000.

The previous prime is 18474327947833. The next prime is 18474327947849. The reversal of 18474327947847 is 74874972347481.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18474327947847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18474327947849) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1589730697 + ... + 1589742317.

It is an arithmetic number, because the mean of its divisors is an integer number (786859792992).

Almost surely, 2^{18474327947847} is an apocalyptic number.

18474327947847 is a deficient number, since it is larger than the sum of its proper divisors (6705185427897).

18474327947847 is a wasteful number, since it uses less digits than its factorization.

18474327947847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20999.

The product of its digits is 2124251136, while the sum is 75.

The spelling of 18474327947847 in words is "eighteen trillion, four hundred seventy-four billion, three hundred twenty-seven million, nine hundred forty-seven thousand, eight hundred forty-seven".