51261216199 has 2 divisors, whose sum is σ = 51261216200. Its totient is φ = 51261216198.

The previous prime is 51261216197. The next prime is 51261216289. The reversal of 51261216199 is 99161216215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51261216199 - 2¹ = 51261216197 is a prime.

Together with 51261216197, 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 (51261216197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25630608099 + 25630608100.

It is an arithmetic number, because the mean of its divisors is an integer number (25630608100).

Almost surely, 2^51261216199 is an apocalyptic number.

51261216199 is a deficient number, since it is larger than the sum of its proper divisors (1).

51261216199 is an equidigital number, since it uses as much as digits as its factorization.

51261216199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 43.

The spelling of 51261216199 in words is "fifty-one billion, two hundred sixty-one million, two hundred sixteen thousand, one hundred ninety-nine".