16559895561 has 12 divisors (see below), whose sum is σ = 24269599536. Its totient is φ = 10036300120.

The previous prime is 16559895559. The next prime is 16559895571.

16559895561 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 16559895561 - 2¹ = 16559895559 is a prime.

It is a super-3 number, since 3×16559895561³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16559895495 and 16559895504.

It is not an unprimeable number, because it can be changed into a prime (16559895571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22809411 + ... + 22810136.

It is an arithmetic number, because the mean of its divisors is an integer number (2022466628).

Almost surely, 2^16559895561 is an apocalyptic number.

16559895561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16559895561 is a deficient number, since it is larger than the sum of its proper divisors (7709703975).

16559895561 is a wasteful number, since it uses less digits than its factorization.

16559895561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45619572 (or 45619561 counting only the distinct ones).

The product of its digits is 14580000, while the sum is 60.

The spelling of 16559895561 in words is "sixteen billion, five hundred fifty-nine million, eight hundred ninety-five thousand, five hundred sixty-one".