1666769017 has 2 divisors, whose sum is σ = 1666769018. Its totient is φ = 1666769016.

The previous prime is 1666769009. The next prime is 1666769021. The reversal of 1666769017 is 7109676661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1135420416 + 531348601 = 33696^2 + 23051^2 .

It is a cyclic number.

It is not a de Polignac number, because 1666769017 - 2³ = 1666769009 is a prime.

It is a super-2 number, since 2×1666769017² = 5556237912062292578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1666769077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833384508 + 833384509.

It is an arithmetic number, because the mean of its divisors is an integer number (833384509).

Almost surely, 2^1666769017 is an apocalyptic number.

It is an amenable number.

1666769017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666769017 is an equidigital number, since it uses as much as digits as its factorization.

1666769017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 1666769017 is about 40826.0825576004. The cubic root of 1666769017 is about 1185.6553709476.

The spelling of 1666769017 in words is "one billion, six hundred sixty-six million, seven hundred sixty-nine thousand, seventeen".