16561184071 has 2 divisors, whose sum is σ = 16561184072. Its totient is φ = 16561184070.

The previous prime is 16561183993. The next prime is 16561184099. The reversal of 16561184071 is 17048116561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16561184071 - 2⁹ = 16561183559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16561188071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8280592035 + 8280592036.

It is an arithmetic number, because the mean of its divisors is an integer number (8280592036).

Almost surely, 2^16561184071 is an apocalyptic number.

16561184071 is a deficient number, since it is larger than the sum of its proper divisors (1).

16561184071 is an equidigital number, since it uses as much as digits as its factorization.

16561184071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 40.

The spelling of 16561184071 in words is "sixteen billion, five hundred sixty-one million, one hundred eighty-four thousand, seventy-one".