51612452821 has 2 divisors, whose sum is σ = 51612452822. Its totient is φ = 51612452820.

The previous prime is 51612452819. The next prime is 51612452861. The reversal of 51612452821 is 12825421615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44430737796 + 7181715025 = 210786^2 + 84745^2 .

It is a cyclic number.

It is not a de Polignac number, because 51612452821 - 2¹ = 51612452819 is a prime.

Together with 51612452819, 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 (51612452861) 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, 25806226410 + 25806226411.

It is an arithmetic number, because the mean of its divisors is an integer number (25806226411).

Almost surely, 2^51612452821 is an apocalyptic number.

It is an amenable number.

51612452821 is a deficient number, since it is larger than the sum of its proper divisors (1).

51612452821 is an equidigital number, since it uses as much as digits as its factorization.

51612452821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38400, while the sum is 37.

The spelling of 51612452821 in words is "fifty-one billion, six hundred twelve million, four hundred fifty-two thousand, eight hundred twenty-one".