16539893561 has 16 divisors (see below), whose sum is σ = 17813606400. Its totient is φ = 15320406288.

The previous prime is 16539893551. The next prime is 16539893597.

It is a happy number.

16539893561 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 16539893561 - 2⁶ = 16539893497 is a prime.

It is a super-3 number, since 3×16539893561³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16539893497 and 16539893506.

It is not an unprimeable number, because it can be changed into a prime (16539893551) 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 15 ways as a sum of consecutive naturals, for example, 41 + ... + 181878.

It is an arithmetic number, because the mean of its divisors is an integer number (1113350400).

Almost surely, 2^16539893561 is an apocalyptic number.

It is an amenable number.

16539893561 is a deficient number, since it is larger than the sum of its proper divisors (1273712839).

16539893561 is a wasteful number, since it uses less digits than its factorization.

16539893561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182068.

The product of its digits is 5248800, while the sum is 56.

The spelling of 16539893561 in words is "sixteen billion, five hundred thirty-nine million, eight hundred ninety-three thousand, five hundred sixty-one".