16505515650055 has 4 divisors (see below), whose sum is σ = 19806618780072. Its totient is φ = 13204412520040.

The previous prime is 16505515650007. The next prime is 16505515650079. The reversal of 16505515650055 is 55005651550561.

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

It is not a de Polignac number, because 16505515650055 - 2¹³ = 16505515641863 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16505515649990 and 16505515650008.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1650551565001 + ... + 1650551565010.

It is an arithmetic number, because the mean of its divisors is an integer number (4951654695018).

Almost surely, 2^{16505515650055} is an apocalyptic number.

16505515650055 is a deficient number, since it is larger than the sum of its proper divisors (3301103130017).

16505515650055 is an equidigital number, since it uses as much as digits as its factorization.

16505515650055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301103130016.

The product of its (nonzero) digits is 2812500, while the sum is 49.

The spelling of 16505515650055 in words is "sixteen trillion, five hundred five billion, five hundred fifteen million, six hundred fifty thousand, fifty-five".