18447216167 has 4 divisors (see below), whose sum is σ = 18839710176. Its totient is φ = 18054722160.

The previous prime is 18447216089. The next prime is 18447216169. The reversal of 18447216167 is 76161274481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76161274481 = 59 ⋅1290869059.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18447216167 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 392493961 = 18447216167 / (1 + 8 + 4 + 4 + 7 + 2 + 1 + 6 + 1 + 6 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18447216169) 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, 196246934 + ... + 196247027.

It is an arithmetic number, because the mean of its divisors is an integer number (4709927544).

Almost surely, 2^18447216167 is an apocalyptic number.

18447216167 is a deficient number, since it is larger than the sum of its proper divisors (392494009).

18447216167 is an equidigital number, since it uses as much as digits as its factorization.

18447216167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392494008.

The product of its digits is 451584, while the sum is 47.

The spelling of 18447216167 in words is "eighteen billion, four hundred forty-seven million, two hundred sixteen thousand, one hundred sixty-seven".