1005666061 has 2 divisors, whose sum is σ = 1005666062. Its totient is φ = 1005666060.

The previous prime is 1005666049. The next prime is 1005666119. The reversal of 1005666061 is 1606665001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 999761161 + 5904900 = 31619^2 + 2430^2 .

It is a cyclic number.

It is not a de Polignac number, because 1005666061 - 2¹¹ = 1005664013 is a prime.

It is a super-2 number, since 2×1005666061² = 2022728452494511442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1005666001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502833030 + 502833031.

It is an arithmetic number, because the mean of its divisors is an integer number (502833031).

Almost surely, 2^1005666061 is an apocalyptic number.

It is an amenable number.

1005666061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005666061 is an equidigital number, since it uses as much as digits as its factorization.

1005666061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1005666061 is about 31712.2383473636. The cubic root of 1005666061 is about 1001.8851310479.

The spelling of 1005666061 in words is "one billion, five million, six hundred sixty-six thousand, sixty-one".