16505799 has 4 divisors (see below), whose sum is σ = 22007736. Its totient is φ = 11003864.

The previous prime is 16505777. The next prime is 16505803. The reversal of 16505799 is 99750561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99750561 = 3 ⋅33250187.

It is a cyclic number.

It is not a de Polignac number, because 16505799 - 2⁵ = 16505767 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16505799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16505719) 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, 2750964 + ... + 2750969.

It is an arithmetic number, because the mean of its divisors is an integer number (5501934).

Almost surely, 2^16505799 is an apocalyptic number.

16505799 is a deficient number, since it is larger than the sum of its proper divisors (5501937).

16505799 is an equidigital number, since it uses as much as digits as its factorization.

16505799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5501936.

The product of its (nonzero) digits is 85050, while the sum is 42.

The square root of 16505799 is about 4062.7329471675. The cubic root of 16505799 is about 254.6119896764.

The spelling of 16505799 in words is "sixteen million, five hundred five thousand, seven hundred ninety-nine".