666842943 has 32 divisors (see below), whose sum is σ = 1014280960. Its totient is φ = 386311680.

The previous prime is 666842927. The next prime is 666842963. The reversal of 666842943 is 349248666.

It is not a de Polignac number, because 666842943 - 2⁴ = 666842927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666842892 and 666842901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666842963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118023 + ... + 123543.

It is an arithmetic number, because the mean of its divisors is an integer number (31696280).

Almost surely, 2^666842943 is an apocalyptic number.

666842943 is a deficient number, since it is larger than the sum of its proper divisors (347438017).

666842943 is a wasteful number, since it uses less digits than its factorization.

666842943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5719.

The product of its digits is 1492992, while the sum is 48.

The square root of 666842943 is about 25823.3023256128. The cubic root of 666842943 is about 873.6574537316.

The spelling of 666842943 in words is "six hundred sixty-six million, eight hundred forty-two thousand, nine hundred forty-three".