161134335516565 has 4 divisors (see below), whose sum is σ = 193361202619884. Its totient is φ = 128907468413248.

The previous prime is 161134335516541. The next prime is 161134335516569. The reversal of 161134335516565 is 565615533431161.

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 46982675980881 + 114151659535684 = 6854391^2 + 10684178^2 .

It is a cyclic number.

It is not a de Polignac number, because 161134335516565 - 2²¹ = 161134333419413 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 (161134335516569) 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, 16113433551652 + ... + 16113433551661.

It is an arithmetic number, because the mean of its divisors is an integer number (48340300654971).

Almost surely, 2^{161134335516565} is an apocalyptic number.

It is an amenable number.

161134335516565 is a deficient number, since it is larger than the sum of its proper divisors (32226867103319).

161134335516565 is an equidigital number, since it uses as much as digits as its factorization.

161134335516565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32226867103318.

The product of its digits is 14580000, while the sum is 55.

The spelling of 161134335516565 in words is "one hundred sixty-one trillion, one hundred thirty-four billion, three hundred thirty-five million, five hundred sixteen thousand, five hundred sixty-five".