51612452861 has 2 divisors, whose sum is σ = 51612452862. Its totient is φ = 51612452860.

The previous prime is 51612452821. The next prime is 51612452869. The reversal of 51612452861 is 16825421615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48430364761 + 3182088100 = 220069^2 + 56410^2 .

It is a cyclic number.

It is not a de Polignac number, because 51612452861 - 2³⁴ = 34432583677 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51612452869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25806226430 + 25806226431.

It is an arithmetic number, because the mean of its divisors is an integer number (25806226431).

Almost surely, 2^51612452861 is an apocalyptic number.

It is an amenable number.

51612452861 is a deficient number, since it is larger than the sum of its proper divisors (1).

51612452861 is an equidigital number, since it uses as much as digits as its factorization.

51612452861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115200, while the sum is 41.

The spelling of 51612452861 in words is "fifty-one billion, six hundred twelve million, four hundred fifty-two thousand, eight hundred sixty-one".