16556776177127 has 4 divisors (see below), whose sum is σ = 16556790207720. Its totient is φ = 16556762146536.

The previous prime is 16556776177099. The next prime is 16556776177169. The reversal of 16556776177127 is 72177167765561.

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

It is a cyclic number.

It is not a de Polignac number, because 16556776177127 - 2²⁸ = 16556507741671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16556776177927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5064377 + ... + 7665602.

It is an arithmetic number, because the mean of its divisors is an integer number (4139197551930).

Almost surely, 2^{16556776177127} is an apocalyptic number.

16556776177127 is a deficient number, since it is larger than the sum of its proper divisors (14030593).

16556776177127 is a wasteful number, since it uses less digits than its factorization.

16556776177127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14030592.

The product of its digits is 181515600, while the sum is 68.

The spelling of 16556776177127 in words is "sixteen trillion, five hundred fifty-six billion, seven hundred seventy-six million, one hundred seventy-seven thousand, one hundred twenty-seven".