16571080561 has 4 divisors (see below), whose sum is σ = 18938377792. Its totient is φ = 14203783332.

The previous prime is 16571080469. The next prime is 16571080579. The reversal of 16571080561 is 16508017561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16571080561 - 2³³ = 7981145969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16571000561) 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 3 ways as a sum of consecutive naturals, for example, 1183648605 + ... + 1183648618.

It is an arithmetic number, because the mean of its divisors is an integer number (4734594448).

Almost surely, 2^16571080561 is an apocalyptic number.

It is an amenable number.

16571080561 is a deficient number, since it is larger than the sum of its proper divisors (2367297231).

16571080561 is an equidigital number, since it uses as much as digits as its factorization.

16571080561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367297230.

The product of its (nonzero) digits is 50400, while the sum is 40.

The spelling of 16571080561 in words is "sixteen billion, five hundred seventy-one million, eighty thousand, five hundred sixty-one".