16666539 has 16 divisors (see below), whose sum is σ = 23261472. Its totient is φ = 10603008.

The previous prime is 16666523. The next prime is 16666547. The reversal of 16666539 is 93566661.

It is not a de Polignac number, because 16666539 - 2⁴ = 16666523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16666539.

It is not an unprimeable number, because it can be changed into a prime (16666549) 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, 4467 + ... + 7299.

It is an arithmetic number, because the mean of its divisors is an integer number (1453842).

Almost surely, 2^16666539 is an apocalyptic number.

16666539 is a deficient number, since it is larger than the sum of its proper divisors (6594933).

16666539 is a wasteful number, since it uses less digits than its factorization.

16666539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926.

The product of its digits is 174960, while the sum is 42.

The square root of 16666539 is about 4082.4672686992. The cubic root of 16666539 is about 255.4358252484.

It can be divided in two parts, 16666 and 539, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 16666539 in words is "sixteen million, six hundred sixty-six thousand, five hundred thirty-nine".