51163255861 has 2 divisors, whose sum is σ = 51163255862. Its totient is φ = 51163255860.

The previous prime is 51163255853. The next prime is 51163255883. The reversal of 51163255861 is 16855236115.

51163255861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36475270225 + 14687985636 = 190985^2 + 121194^2 .

It is a cyclic number.

It is not a de Polignac number, because 51163255861 - 2³ = 51163255853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51163255061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25581627930 + 25581627931.

It is an arithmetic number, because the mean of its divisors is an integer number (25581627931).

Almost surely, 2^51163255861 is an apocalyptic number.

It is an amenable number.

51163255861 is a deficient number, since it is larger than the sum of its proper divisors (1).

51163255861 is an equidigital number, since it uses as much as digits as its factorization.

51163255861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216000, while the sum is 43.

The spelling of 51163255861 in words is "fifty-one billion, one hundred sixty-three million, two hundred fifty-five thousand, eight hundred sixty-one".