165506324413 has 8 divisors (see below), whose sum is σ = 168252965496. Its totient is φ = 162760761600.

The previous prime is 165506324353. The next prime is 165506324429. The reversal of 165506324413 is 314423605561.

It can be written as a sum of positive squares in 4 ways, for example, as 5612706724 + 159893617689 = 74918^2 + 399867^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 165506324413 - 2⁹ = 165506323901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165506324813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42945 + ... + 576937.

It is an arithmetic number, because the mean of its divisors is an integer number (21031620687).

Almost surely, 2^165506324413 is an apocalyptic number.

It is an amenable number.

165506324413 is a deficient number, since it is larger than the sum of its proper divisors (2746641083).

165506324413 is an equidigital number, since it uses as much as digits as its factorization.

165506324413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539135.

The product of its (nonzero) digits is 259200, while the sum is 40.

Adding to 165506324413 its reverse (314423605561), we get a palindrome (479929929974).

The spelling of 165506324413 in words is "one hundred sixty-five billion, five hundred six million, three hundred twenty-four thousand, four hundred thirteen".