12478216171 has 2 divisors, whose sum is σ = 12478216172. Its totient is φ = 12478216170.

The previous prime is 12478216169. The next prime is 12478216187. The reversal of 12478216171 is 17161287421.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (17161287421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12478216171 - 2¹ = 12478216169 is a prime.

Together with 12478216169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (12478216571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6239108085 + 6239108086.

It is an arithmetic number, because the mean of its divisors is an integer number (6239108086).

Almost surely, 2^12478216171 is an apocalyptic number.

12478216171 is a deficient number, since it is larger than the sum of its proper divisors (1).

12478216171 is an equidigital number, since it uses as much as digits as its factorization.

12478216171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 40.

The spelling of 12478216171 in words is "twelve billion, four hundred seventy-eight million, two hundred sixteen thousand, one hundred seventy-one".