18317162447 has 4 divisors (see below), whose sum is σ = 18318559056. Its totient is φ = 18315765840.

The previous prime is 18317162407. The next prime is 18317162449. The reversal of 18317162447 is 74426171381.

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 18317162447 - 2⁸ = 18317162191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18317162398 and 18317162407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18317162449) 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, 678443 + ... + 704924.

It is an arithmetic number, because the mean of its divisors is an integer number (4579639764).

Almost surely, 2^18317162447 is an apocalyptic number.

18317162447 is a deficient number, since it is larger than the sum of its proper divisors (1396609).

18317162447 is a wasteful number, since it uses less digits than its factorization.

18317162447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396608.

The product of its digits is 225792, while the sum is 44.

The spelling of 18317162447 in words is "eighteen billion, three hundred seventeen million, one hundred sixty-two thousand, four hundred forty-seven".