51666111089 has 2 divisors, whose sum is σ = 51666111090. Its totient is φ = 51666111088.

The previous prime is 51666111067. The next prime is 51666111109. The reversal of 51666111089 is 98011166615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25903293025 + 25762818064 = 160945^2 + 160508^2 .

It is a cyclic number.

It is not a de Polignac number, because 51666111089 - 2¹² = 51666106993 is a prime.

It is not a weakly prime, because it can be changed into another prime (51666111059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25833055544 + 25833055545.

It is an arithmetic number, because the mean of its divisors is an integer number (25833055545).

Almost surely, 2^51666111089 is an apocalyptic number.

It is an amenable number.

51666111089 is a deficient number, since it is larger than the sum of its proper divisors (1).

51666111089 is an equidigital number, since it uses as much as digits as its factorization.

51666111089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 44.

The spelling of 51666111089 in words is "fifty-one billion, six hundred sixty-six million, one hundred eleven thousand, eighty-nine".