666807043 has 12 divisors (see below), whose sum is σ = 788392992. Its totient is φ = 562176720.

The previous prime is 666807019. The next prime is 666807059. The reversal of 666807043 is 340708666.

It is a de Polignac number, because none of the positive numbers 2^k-666807043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666806987 and 666807005.

It is not an unprimeable number, because it can be changed into a prime (666807013) 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 in 11 ways as a sum of consecutive naturals, for example, 108555 + ... + 114532.

It is an arithmetic number, because the mean of its divisors is an integer number (65699416).

Almost surely, 2^666807043 is an apocalyptic number.

666807043 is a deficient number, since it is larger than the sum of its proper divisors (121585949).

666807043 is a wasteful number, since it uses less digits than its factorization.

666807043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223162 (or 223155 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 666807043 is about 25822.6072076388. The cubic root of 666807043 is about 873.6417754445.

The spelling of 666807043 in words is "six hundred sixty-six million, eight hundred seven thousand, forty-three".