16213947556 has 9 divisors (see below), whose sum is σ = 28374853899. Its totient is φ = 8106846444.

The previous prime is 16213947527. The next prime is 16213947599. The reversal of 16213947556 is 65574931261.

The square root of 16213947556 is 127334.

It is a perfect power (a square), and thus also a powerful number.

16213947556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 222835 + ... + 286501.

Almost surely, 2^16213947556 is an apocalyptic number.

16213947556 is the 127334-th square number.

It is an amenable number.

16213947556 is a deficient number, since it is larger than the sum of its proper divisors (12160906343).

16213947556 is an frugal number, since it uses more digits than its factorization.

16213947556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127338 (or 63669 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 49.

Multiplying 16213947556 by its sum of digits (49), we get a square (794483430244 = 891338²).

The spelling of 16213947556 in words is "sixteen billion, two hundred thirteen million, nine hundred forty-seven thousand, five hundred fifty-six".