66004539 has 16 divisors (see below), whose sum is σ = 89907840. Its totient is φ = 43059200.

The previous prime is 66004531. The next prime is 66004541. The reversal of 66004539 is 93540066.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66004539 - 2³ = 66004531 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66004531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44764 + ... + 46214.

It is an arithmetic number, because the mean of its divisors is an integer number (5619240).

Almost surely, 2^66004539 is an apocalyptic number.

66004539 is a deficient number, since it is larger than the sum of its proper divisors (23903301).

66004539 is a wasteful number, since it uses less digits than its factorization.

66004539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 66004539 is about 8124.3177559719. The cubic root of 66004539 is about 404.1332660864.

The spelling of 66004539 in words is "sixty-six million, four thousand, five hundred thirty-nine".