16813391505 has 16 divisors (see below), whose sum is σ = 27037986624. Its totient is φ = 8921622080.

The previous prime is 16813391503. The next prime is 16813391513. The reversal of 16813391505 is 50519331861.

It is not a de Polignac number, because 16813391505 - 2¹ = 16813391503 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16813391503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2841951 + ... + 2847860.

It is an arithmetic number, because the mean of its divisors is an integer number (1689874164).

Almost surely, 2^16813391505 is an apocalyptic number.

16813391505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16813391505 is a deficient number, since it is larger than the sum of its proper divisors (10224595119).

16813391505 is a wasteful number, since it uses less digits than its factorization.

16813391505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5690016.

The product of its (nonzero) digits is 97200, while the sum is 42.

The spelling of 16813391505 in words is "sixteen billion, eight hundred thirteen million, three hundred ninety-one thousand, five hundred five".