51680635261 has 2 divisors, whose sum is σ = 51680635262. Its totient is φ = 51680635260.

The previous prime is 51680635247. The next prime is 51680635267. The reversal of 51680635261 is 16253608615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45456372025 + 6224263236 = 213205^2 + 78894^2 .

It is a cyclic number.

It is not a de Polignac number, because 51680635261 - 2⁵ = 51680635229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51680635267) 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, 25840317630 + 25840317631.

It is an arithmetic number, because the mean of its divisors is an integer number (25840317631).

Almost surely, 2^51680635261 is an apocalyptic number.

It is an amenable number.

51680635261 is a deficient number, since it is larger than the sum of its proper divisors (1).

51680635261 is an equidigital number, since it uses as much as digits as its factorization.

51680635261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 51680635261 in words is "fifty-one billion, six hundred eighty million, six hundred thirty-five thousand, two hundred sixty-one".