16891309505 has 8 divisors (see below), whose sum is σ = 23165224512. Its totient is φ = 11582612208.

The previous prime is 16891309489. The next prime is 16891309511. The reversal of 16891309505 is 50590319861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16891309505 - 2⁴ = 16891309489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16891309505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241304387 + ... + 241304456.

It is an arithmetic number, because the mean of its divisors is an integer number (2895653064).

Almost surely, 2^16891309505 is an apocalyptic number.

It is an amenable number.

16891309505 is a deficient number, since it is larger than the sum of its proper divisors (6273915007).

16891309505 is an equidigital number, since it uses as much as digits as its factorization.

16891309505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482608855.

The product of its (nonzero) digits is 291600, while the sum is 47.

The spelling of 16891309505 in words is "sixteen billion, eight hundred ninety-one million, three hundred nine thousand, five hundred five".