1066805161 has 2 divisors, whose sum is σ = 1066805162. Its totient is φ = 1066805160.

The previous prime is 1066805119. The next prime is 1066805197. The reversal of 1066805161 is 1615086601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 792704025 + 274101136 = 28155^2 + 16556^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066805161 - 2¹¹ = 1066803113 is a prime.

It is a super-2 number, since 2×1066805161² = 2276146503072471842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1066805111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 533402580 + 533402581.

It is an arithmetic number, because the mean of its divisors is an integer number (533402581).

Almost surely, 2^1066805161 is an apocalyptic number.

It is an amenable number.

1066805161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1066805161 is an equidigital number, since it uses as much as digits as its factorization.

1066805161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1066805161 is about 32661.9834210968. The cubic root of 1066805161 is about 1021.7901285752.

The spelling of 1066805161 in words is "one billion, sixty-six million, eight hundred five thousand, one hundred sixty-one".