16191799009 has 3 divisors (see below), whose sum is σ = 16191926257. Its totient is φ = 16191671762.

The previous prime is 16191798983. The next prime is 16191799027. The reversal of 16191799009 is 90099719161.

The square root of 16191799009 is 127247.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 16191799009 - 2¹⁷ = 16191667937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16191799409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 63624 + ... + 190870.

Almost surely, 2^16191799009 is an apocalyptic number.

16191799009 is the 127247-th square number.

16191799009 is the 63624-th centered octagonal number.

It is an amenable number.

16191799009 is a deficient number, since it is larger than the sum of its proper divisors (127248).

16191799009 is an frugal number, since it uses more digits than its factorization.

16191799009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254494 (or 127247 counting only the distinct ones).

The product of its (nonzero) digits is 275562, while the sum is 52.

The spelling of 16191799009 in words is "sixteen billion, one hundred ninety-one million, seven hundred ninety-nine thousand, nine".