16547874561 has 32 divisors (see below), whose sum is σ = 26272677120. Its totient is φ = 10267057152.

The previous prime is 16547874557. The next prime is 16547874583.

16547874561 is a `hidden beast` number, since 1 + 6 + 5 + 4 + 7 + 8 + 74 + 561 = 666.

16547874561 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 16547874561 - 2² = 16547874557 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16547874498 and 16547874507.

It is not an unprimeable number, because it can be changed into a prime (16547874061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 337120 + ... + 383073.

It is an arithmetic number, because the mean of its divisors is an integer number (821021160).

Almost surely, 2^16547874561 is an apocalyptic number.

It is an amenable number.

16547874561 is a deficient number, since it is larger than the sum of its proper divisors (9724802559).

16547874561 is a wasteful number, since it uses less digits than its factorization.

16547874561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720262 (or 720256 counting only the distinct ones).

The product of its digits is 5644800, while the sum is 54.

The spelling of 16547874561 in words is "sixteen billion, five hundred forty-seven million, eight hundred seventy-four thousand, five hundred sixty-one".