15985730209 has 4 divisors (see below), whose sum is σ = 15986093616. Its totient is φ = 15985366804.

The previous prime is 15985730179. The next prime is 15985730221. The reversal of 15985730209 is 90203758951.

15985730209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15985730209 - 2⁵ = 15985730177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15985730269) 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, 104899 + ... + 207304.

It is an arithmetic number, because the mean of its divisors is an integer number (3996523404).

Almost surely, 2^15985730209 is an apocalyptic number.

It is an amenable number.

15985730209 is a deficient number, since it is larger than the sum of its proper divisors (363407).

15985730209 is an equidigital number, since it uses as much as digits as its factorization.

15985730209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363406.

The product of its (nonzero) digits is 680400, while the sum is 49.

The spelling of 15985730209 in words is "fifteen billion, nine hundred eighty-five million, seven hundred thirty thousand, two hundred nine".