16545724361165 has 4 divisors (see below), whose sum is σ = 19854869233404. Its totient is φ = 13236579488928.

The previous prime is 16545724361161. The next prime is 16545724361191. The reversal of 16545724361165 is 56116342754561.

It is a happy number.

16545724361165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3049902481609 + 13495821879556 = 1746397^2 + 3673666^2 .

It is a cyclic number.

It is not a de Polignac number, because 16545724361165 - 2² = 16545724361161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16545724361165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16545724361161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1654572436112 + ... + 1654572436121.

It is an arithmetic number, because the mean of its divisors is an integer number (4963717308351).

Almost surely, 2^{16545724361165} is an apocalyptic number.

It is an amenable number.

16545724361165 is a deficient number, since it is larger than the sum of its proper divisors (3309144872239).

16545724361165 is an equidigital number, since it uses as much as digits as its factorization.

16545724361165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309144872238.

The product of its digits is 18144000, while the sum is 56.

The spelling of 16545724361165 in words is "sixteen trillion, five hundred forty-five billion, seven hundred twenty-four million, three hundred sixty-one thousand, one hundred sixty-five".