16814049561 has 9 divisors (see below), whose sum is σ = 24287522389. Its totient is φ = 11209107036.

The previous prime is 16814049533. The next prime is 16814049619. The reversal of 16814049561 is 16594041861.

The square root of 16814049561 is 129669.

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

16814049561 is a `hidden beast` number, since 1 + 6 + 8 + 1 + 40 + 49 + 561 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 16814049561 - 2¹¹ = 16814047513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16814049061) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 367396 + ... + 410618.

Almost surely, 2^16814049561 is an apocalyptic number.

16814049561 is the 129669-th square number.

16814049561 is the 64835-th centered octagonal number.

It is an amenable number.

16814049561 is a deficient number, since it is larger than the sum of its proper divisors (7473472828).

16814049561 is an frugal number, since it uses more digits than its factorization.

16814049561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86452 (or 43226 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 16814049561 in words is "sixteen billion, eight hundred fourteen million, forty-nine thousand, five hundred sixty-one".