51816668171 has 2 divisors, whose sum is σ = 51816668172. Its totient is φ = 51816668170.

The previous prime is 51816668153. The next prime is 51816668179. The reversal of 51816668171 is 17186661815.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51816668171 - 2⁶ = 51816668107 is a prime.

It is not a weakly prime, because it can be changed into another prime (51816668179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25908334085 + 25908334086.

It is an arithmetic number, because the mean of its divisors is an integer number (25908334086).

Almost surely, 2^51816668171 is an apocalyptic number.

51816668171 is a deficient number, since it is larger than the sum of its proper divisors (1).

51816668171 is an equidigital number, since it uses as much as digits as its factorization.

51816668171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 50.

The spelling of 51816668171 in words is "fifty-one billion, eight hundred sixteen million, six hundred sixty-eight thousand, one hundred seventy-one".