18317501447047 has 4 divisors (see below), whose sum is σ = 19982728851336. Its totient is φ = 16652274042760.

The previous prime is 18317501446973. The next prime is 18317501447059. The reversal of 18317501447047 is 74074410571381.

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

It is a cyclic number.

It is not a de Polignac number, because 18317501447047 - 2¹⁵ = 18317501414279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18317501446985 and 18317501447003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18317501477047) 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, 832613702128 + ... + 832613702149.

It is an arithmetic number, because the mean of its divisors is an integer number (4995682212834).

Almost surely, 2^{18317501447047} is an apocalyptic number.

18317501447047 is a deficient number, since it is larger than the sum of its proper divisors (1665227404289).

18317501447047 is a wasteful number, since it uses less digits than its factorization.

18317501447047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665227404288.

The product of its (nonzero) digits is 2634240, while the sum is 52.

The spelling of 18317501447047 in words is "eighteen trillion, three hundred seventeen billion, five hundred one million, four hundred forty-seven thousand, forty-seven".