16555620477227 has 4 divisors (see below), whose sum is σ = 17829129744720. Its totient is φ = 15282111209736.

The previous prime is 16555620477203. The next prime is 16555620477251. The reversal of 16555620477227 is 72277402655561.

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

It is an interprime number because it is at equal distance from previous prime (16555620477203) and next prime (16555620477251).

It is a cyclic number.

It is not a de Polignac number, because 16555620477227 - 2⁶ = 16555620477163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16555620477527) by changing a digit.

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, 636754633727 + ... + 636754633752.

It is an arithmetic number, because the mean of its divisors is an integer number (4457282436180).

Almost surely, 2^{16555620477227} is an apocalyptic number.

16555620477227 is a deficient number, since it is larger than the sum of its proper divisors (1273509267493).

16555620477227 is a wasteful number, since it uses less digits than its factorization.

16555620477227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273509267492.

The product of its (nonzero) digits is 49392000, while the sum is 59.

The spelling of 16555620477227 in words is "sixteen trillion, five hundred fifty-five billion, six hundred twenty million, four hundred seventy-seven thousand, two hundred twenty-seven".