2166651841 has 2 divisors, whose sum is σ = 2166651842. Its totient is φ = 2166651840.

The previous prime is 2166651787. The next prime is 2166651859. The reversal of 2166651841 is 1481566612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1433379600 + 733272241 = 37860^2 + 27079^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166651841 - 2⁹ = 2166651329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2166651794 and 2166651803.

It is not a weakly prime, because it can be changed into another prime (2166651341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083325920 + 1083325921.

It is an arithmetic number, because the mean of its divisors is an integer number (1083325921).

Almost surely, 2^2166651841 is an apocalyptic number.

It is an amenable number.

2166651841 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166651841 is an equidigital number, since it uses as much as digits as its factorization.

2166651841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 2166651841 is about 46547.3075590844. The cubic root of 2166651841 is about 1293.9863946789.

The spelling of 2166651841 in words is "two billion, one hundred sixty-six million, six hundred fifty-one thousand, eight hundred forty-one".