16551106505 has 4 divisors (see below), whose sum is σ = 19861327812. Its totient is φ = 13240885200.

The previous prime is 16551106463. The next prime is 16551106529. The reversal of 16551106505 is 50560115561.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6706299664 + 9844806841 = 81892^2 + 99221^2 .

It is not a de Polignac number, because 16551106505 - 2⁸ = 16551106249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1655110646 + ... + 1655110655.

It is an arithmetic number, because the mean of its divisors is an integer number (4965331953).

Almost surely, 2^16551106505 is an apocalyptic number.

It is an amenable number.

16551106505 is a deficient number, since it is larger than the sum of its proper divisors (3310221307).

16551106505 is an equidigital number, since it uses as much as digits as its factorization.

16551106505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310221306.

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 16551106505 in words is "sixteen billion, five hundred fifty-one million, one hundred six thousand, five hundred five".