16561182897727 has 16 divisors (see below), whose sum is σ = 18051313982688. Its totient is φ = 15101963458560.

The previous prime is 16561182897697. The next prime is 16561182897737. The reversal of 16561182897727 is 72779828116561.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16561182897727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561182897737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14469483 + ... + 15572035.

It is an arithmetic number, because the mean of its divisors is an integer number (1128207123918).

Almost surely, 2^{16561182897727} is an apocalyptic number.

16561182897727 is a deficient number, since it is larger than the sum of its proper divisors (1490131084961).

16561182897727 is a wasteful number, since it uses less digits than its factorization.

16561182897727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116570.

The product of its digits is 142248960, while the sum is 70.

The spelling of 16561182897727 in words is "sixteen trillion, five hundred sixty-one billion, one hundred eighty-two million, eight hundred ninety-seven thousand, seven hundred twenty-seven".