11666543 has 16 divisors (see below), whose sum is σ = 14017536. Its totient is φ = 9493440.

The previous prime is 11666533. The next prime is 11666549. The reversal of 11666543 is 34566611.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11666543 is a prime.

It is a super-2 number, since 2×11666543² = 272216451141698, 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 (11666549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37358 + ... + 37668.

It is an arithmetic number, because the mean of its divisors is an integer number (876096).

Almost surely, 2^11666543 is an apocalyptic number.

11666543 is a deficient number, since it is larger than the sum of its proper divisors (2350993).

11666543 is a wasteful number, since it uses less digits than its factorization.

11666543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574.

The product of its digits is 12960, while the sum is 32.

The square root of 11666543 is about 3415.6321523255. The cubic root of 11666543 is about 226.8022691581.

The spelling of 11666543 in words is "eleven million, six hundred sixty-six thousand, five hundred forty-three".