666647058843 has 20 divisors (see below), whose sum is σ = 1009497347848. Its totient is φ = 438343267680.

The previous prime is 666647058809. The next prime is 666647058863. The reversal of 666647058843 is 348850746666.

It is not a de Polignac number, because 666647058843 - 2²² = 666642864539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666647058863) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 56365393 + ... + 56377218.

Almost surely, 2^666647058843 is an apocalyptic number.

666647058843 is a deficient number, since it is larger than the sum of its proper divisors (342850289005).

666647058843 is a wasteful number, since it uses less digits than its factorization.

666647058843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112742696 (or 112742687 counting only the distinct ones).

The product of its (nonzero) digits is 139345920, while the sum is 63.

The spelling of 666647058843 in words is "six hundred sixty-six billion, six hundred forty-seven million, fifty-eight thousand, eight hundred forty-three".