165343161343561 has 4 divisors (see below), whose sum is σ = 166084610497792. Its totient is φ = 164601712189332.

The previous prime is 165343161343543. The next prime is 165343161343571.

It is a happy number.

165343161343561 is nontrivially palindromic in base 10.

165343161343561 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165343161343561 - 2³⁹ = 164793405529673 is a prime.

It is a super-2 number, since 2×165343161343561² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165343161343499 and 165343161343508.

It is not an unprimeable number, because it can be changed into a prime (165343161343571) 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, 370724576781 + ... + 370724577226.

It is an arithmetic number, because the mean of its divisors is an integer number (41521152624448).

Almost surely, 2^{165343161343561} is an apocalyptic number.

It is an amenable number.

165343161343561 is a deficient number, since it is larger than the sum of its proper divisors (741449154231).

165343161343561 is an equidigital number, since it uses as much as digits as its factorization.

165343161343561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 741449154230.

The product of its digits is 6998400, while the sum is 52.

The spelling of 165343161343561 in words is "one hundred sixty-five trillion, three hundred forty-three billion, one hundred sixty-one million, three hundred forty-three thousand, five hundred sixty-one".