51164602261 has 2 divisors, whose sum is σ = 51164602262. Its totient is φ = 51164602260.

The previous prime is 51164602249. The next prime is 51164602277. The reversal of 51164602261 is 16220646115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50841681361 + 322920900 = 225481^2 + 17970^2 .

It is a cyclic number.

It is not a de Polignac number, because 51164602261 - 2⁷ = 51164602133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51164603261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25582301130 + 25582301131.

It is an arithmetic number, because the mean of its divisors is an integer number (25582301131).

Almost surely, 2^51164602261 is an apocalyptic number.

It is an amenable number.

51164602261 is a deficient number, since it is larger than the sum of its proper divisors (1).

51164602261 is an equidigital number, since it uses as much as digits as its factorization.

51164602261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 51164602261 in words is "fifty-one billion, one hundred sixty-four million, six hundred two thousand, two hundred sixty-one".