6667543 has 4 divisors (see below), whose sum is σ = 6830208. Its totient is φ = 6504880.

The previous prime is 6667541. The next prime is 6667589. The reversal of 6667543 is 3457666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6667543 - 2¹ = 6667541 is a prime.

It is a super-2 number, since 2×6667543² = 88912259313698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6667541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81271 + ... + 81352.

It is an arithmetic number, because the mean of its divisors is an integer number (1707552).

Almost surely, 2^6667543 is an apocalyptic number.

6667543 is a deficient number, since it is larger than the sum of its proper divisors (162665).

6667543 is a wasteful number, since it uses less digits than its factorization.

6667543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162664.

The product of its digits is 90720, while the sum is 37.

The square root of 6667543 is about 2582.1585931155. The cubic root of 6667543 is about 188.2154520273.

The spelling of 6667543 in words is "six million, six hundred sixty-seven thousand, five hundred forty-three".