2666543 has 4 divisors (see below), whose sum is σ = 2908968. Its totient is φ = 2424120.

The previous prime is 2666539. The next prime is 2666561. The reversal of 2666543 is 3456662.

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 2666543 - 2² = 2666539 is a prime.

It is a super-2 number, since 2×2666543² = 14220903141698, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666513) 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, 121196 + ... + 121217.

It is an arithmetic number, because the mean of its divisors is an integer number (727242).

2^2666543 is an apocalyptic number.

2666543 is a deficient number, since it is larger than the sum of its proper divisors (242425).

2666543 is a wasteful number, since it uses less digits than its factorization.

2666543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242424.

The product of its digits is 25920, while the sum is 32.

The square root of 2666543 is about 1632.9552963875. The cubic root of 2666543 is about 138.6701111950.

The spelling of 2666543 in words is "two million, six hundred sixty-six thousand, five hundred forty-three".