1566666011 has 2 divisors, whose sum is σ = 1566666012. Its totient is φ = 1566666010.

The previous prime is 1566666007. The next prime is 1566666053. The reversal of 1566666011 is 1106666651.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1566666011 - 2² = 1566666007 is a prime.

It is not a weakly prime, because it can be changed into another prime (1566666001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 783333005 + 783333006.

It is an arithmetic number, because the mean of its divisors is an integer number (783333006).

Almost surely, 2^1566666011 is an apocalyptic number.

1566666011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1566666011 is an equidigital number, since it uses as much as digits as its factorization.

1566666011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 1566666011 is about 39581.1320075614. The cubic root of 1566666011 is about 1161.4275950640.

The spelling of 1566666011 in words is "one billion, five hundred sixty-six million, six hundred sixty-six thousand, eleven".