666650043 has 6 divisors (see below), whose sum is σ = 962938964. Its totient is φ = 444433356.

The previous prime is 666650041. The next prime is 666650099. The reversal of 666650043 is 340056666.

It is not a de Polignac number, because 666650043 - 2¹ = 666650041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666650041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37036105 + ... + 37036122.

Almost surely, 2^666650043 is an apocalyptic number.

666650043 is a deficient number, since it is larger than the sum of its proper divisors (296288921).

666650043 is a wasteful number, since it uses less digits than its factorization.

666650043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74072233 (or 74072230 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 666650043 is about 25819.5670567885. The cubic root of 666650043 is about 873.5732036207.

The spelling of 666650043 in words is "six hundred sixty-six million, six hundred fifty thousand, forty-three".