51166560161 has 2 divisors, whose sum is σ = 51166560162. Its totient is φ = 51166560160.

The previous prime is 51166560091. The next prime is 51166560163. The reversal of 51166560161 is 16106566115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41117700625 + 10048859536 = 202775^2 + 100244^2 .

It is a cyclic number.

It is not a de Polignac number, because 51166560161 - 2²² = 51162365857 is a prime.

Together with 51166560163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51166560163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25583280080 + 25583280081.

It is an arithmetic number, because the mean of its divisors is an integer number (25583280081).

Almost surely, 2^51166560161 is an apocalyptic number.

It is an amenable number.

51166560161 is a deficient number, since it is larger than the sum of its proper divisors (1).

51166560161 is an equidigital number, since it uses as much as digits as its factorization.

51166560161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 51166560161 in words is "fifty-one billion, one hundred sixty-six million, five hundred sixty thousand, one hundred sixty-one".