16561308322743 has 8 divisors (see below), whose sum is σ = 22082069993088. Its totient is φ = 11040709433784.

The previous prime is 16561308322729. The next prime is 16561308322813. The reversal of 16561308322743 is 34722380316561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16561308322743 - 2¹⁷ = 16561308191671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16561308322343) 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 7 ways as a sum of consecutive naturals, for example, 40457755 + ... + 40865052.

It is an arithmetic number, because the mean of its divisors is an integer number (2760258749136).

Almost surely, 2^{16561308322743} is an apocalyptic number.

16561308322743 is a deficient number, since it is larger than the sum of its proper divisors (5520761670345).

16561308322743 is an equidigital number, since it uses as much as digits as its factorization.

16561308322743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81390693.

The product of its (nonzero) digits is 4354560, while the sum is 51.

The spelling of 16561308322743 in words is "sixteen trillion, five hundred sixty-one billion, three hundred eight million, three hundred twenty-two thousand, seven hundred forty-three".