66042543 has 12 divisors (see below), whose sum is σ = 102433560. Its totient is φ = 37738512.

The previous prime is 66042533. The next prime is 66042551. The reversal of 66042543 is 34524066.

It is not a de Polignac number, because 66042543 - 2⁶ = 66042479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66042543.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66042533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224488 + ... + 224781.

It is an arithmetic number, because the mean of its divisors is an integer number (8536130).

Almost surely, 2^66042543 is an apocalyptic number.

66042543 is a deficient number, since it is larger than the sum of its proper divisors (36391017).

66042543 is a wasteful number, since it uses less digits than its factorization.

66042543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449286 (or 449279 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 66042543 is about 8126.6563234826. The cubic root of 66042543 is about 404.2108149646.

The spelling of 66042543 in words is "sixty-six million, forty-two thousand, five hundred forty-three".