1666707043 has 2 divisors, whose sum is σ = 1666707044. Its totient is φ = 1666707042.

The previous prime is 1666707011. The next prime is 1666707071. The reversal of 1666707043 is 3407076661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666707043 - 2⁵ = 1666707011 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1666706987 and 1666707005.

It is not a weakly prime, because it can be changed into another prime (1666707083) 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, 833353521 + 833353522.

It is an arithmetic number, because the mean of its divisors is an integer number (833353522).

Almost surely, 2^1666707043 is an apocalyptic number.

1666707043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666707043 is an equidigital number, since it uses as much as digits as its factorization.

1666707043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 1666707043 is about 40825.3235504631. The cubic root of 1666707043 is about 1185.6406757067.

The spelling of 1666707043 in words is "one billion, six hundred sixty-six million, seven hundred seven thousand, forty-three".