16561737853 has 2 divisors, whose sum is σ = 16561737854. Its totient is φ = 16561737852.

The previous prime is 16561737851. The next prime is 16561737887. The reversal of 16561737853 is 35873716561.

16561737853 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11846580964 + 4715156889 = 108842^2 + 68667^2 .

It is a cyclic number.

It is not a de Polignac number, because 16561737853 - 2¹ = 16561737851 is a prime.

It is a super-2 number, since 2×16561737853² (a number of 21 digits) contains 22 as substring.

Together with 16561737851, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16561737853.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16561737851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8280868926 + 8280868927.

It is an arithmetic number, because the mean of its divisors is an integer number (8280868927).

Almost surely, 2^16561737853 is an apocalyptic number.

It is an amenable number.

16561737853 is a deficient number, since it is larger than the sum of its proper divisors (1).

16561737853 is an equidigital number, since it uses as much as digits as its factorization.

16561737853 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3175200, while the sum is 52.

The spelling of 16561737853 in words is "sixteen billion, five hundred sixty-one million, seven hundred thirty-seven thousand, eight hundred fifty-three".