16559699 has 4 divisors (see below), whose sum is σ = 17833536. Its totient is φ = 15285864.

The previous prime is 16559693. The next prime is 16559713. The reversal of 16559699 is 99695561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99695561 = 7 ⋅14242223.

It is a cyclic number.

It is not a de Polignac number, because 16559699 - 2⁸ = 16559443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16559693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 636899 + ... + 636924.

It is an arithmetic number, because the mean of its divisors is an integer number (4458384).

Almost surely, 2^16559699 is an apocalyptic number.

16559699 is a deficient number, since it is larger than the sum of its proper divisors (1273837).

16559699 is a wasteful number, since it uses less digits than its factorization.

16559699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273836.

The product of its digits is 656100, while the sum is 50.

The square root of 16559699 is about 4069.3610063498. The cubic root of 16559699 is about 254.8888353086. Note that the first 4 decimals are identical.

The spelling of 16559699 in words is "sixteen million, five hundred fifty-nine thousand, six hundred ninety-nine".