16580243 has 4 divisors (see below), whose sum is σ = 16620048. Its totient is φ = 16540440.

The previous prime is 16580191. The next prime is 16580251. The reversal of 16580243 is 34208561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16580243 - 2²² = 12385939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16582243) 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 3 ways as a sum of consecutive naturals, for example, 19271 + ... + 20112.

It is an arithmetic number, because the mean of its divisors is an integer number (4155012).

Almost surely, 2^16580243 is an apocalyptic number.

16580243 is a deficient number, since it is larger than the sum of its proper divisors (39805).

16580243 is an equidigital number, since it uses as much as digits as its factorization.

16580243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39804.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 16580243 is about 4071.8844531740. The cubic root of 16580243 is about 254.9941969716.

It can be divided in two parts, 165 and 80243, that added together give a palindrome (80408).

The spelling of 16580243 in words is "sixteen million, five hundred eighty thousand, two hundred forty-three".