66042539 has 8 divisors (see below), whose sum is σ = 68341680. Its totient is φ = 63778176.

The previous prime is 66042533. The next prime is 66042551. The reversal of 66042539 is 93524066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66042539 - 2²⁰ = 64993963 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66042499 and 66042508.

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

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4802 + ... + 12455.

It is an arithmetic number, because the mean of its divisors is an integer number (8542710).

Almost surely, 2^66042539 is an apocalyptic number.

66042539 is a deficient number, since it is larger than the sum of its proper divisors (2299141).

66042539 is a wasteful number, since it uses less digits than its factorization.

66042539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17389.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 66042539 is about 8126.6560773789. The cubic root of 66042539 is about 404.2108068040.

The spelling of 66042539 in words is "sixty-six million, forty-two thousand, five hundred thirty-nine".