6666543 has 30 divisors (see below), whose sum is σ = 10805784. Its totient is φ = 4094064.

The previous prime is 6666523. The next prime is 6666547. The reversal of 6666543 is 3456666.

It is not a de Polignac number, because 6666543 - 2⁶ = 6666479 is a prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6666498 and 6666507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666547) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 13446 + ... + 13932.

Almost surely, 2^6666543 is an apocalyptic number.

6666543 is a deficient number, since it is larger than the sum of its proper divisors (4139241).

6666543 is a wasteful number, since it uses less digits than its factorization.

6666543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 503 counting only the distinct ones).

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

The square root of 6666543 is about 2581.9649494135. The cubic root of 6666543 is about 188.2060420211.

The spelling of 6666543 in words is "six million, six hundred sixty-six thousand, five hundred forty-three".