666850043 has 2 divisors, whose sum is σ = 666850044. Its totient is φ = 666850042.

The previous prime is 666850013. The next prime is 666850069. The reversal of 666850043 is 340058666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666850043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666849979 and 666850006.

It is not a weakly prime, because it can be changed into another prime (666850003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333425021 + 333425022.

It is an arithmetic number, because the mean of its divisors is an integer number (333425022).

Almost surely, 2^666850043 is an apocalyptic number.

666850043 is a deficient number, since it is larger than the sum of its proper divisors (1).

666850043 is an equidigital number, since it uses as much as digits as its factorization.

666850043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 666850043 is about 25823.4397979820. The cubic root of 666850043 is about 873.6605543847.

The spelling of 666850043 in words is "six hundred sixty-six million, eight hundred fifty thousand, forty-three".