12216542551 has 2 divisors, whose sum is σ = 12216542552. Its totient is φ = 12216542550.

The previous prime is 12216542549. The next prime is 12216542557. The reversal of 12216542551 is 15524561221.

12216542551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12216542551 - 2¹ = 12216542549 is a prime.

Together with 12216542549, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12216542557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6108271275 + 6108271276.

It is an arithmetic number, because the mean of its divisors is an integer number (6108271276).

Almost surely, 2^12216542551 is an apocalyptic number.

12216542551 is a deficient number, since it is larger than the sum of its proper divisors (1).

12216542551 is an equidigital number, since it uses as much as digits as its factorization.

12216542551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24000, while the sum is 34.

The spelling of 12216542551 in words is "twelve billion, two hundred sixteen million, five hundred forty-two thousand, five hundred fifty-one".