165344435440413 has 4 divisors (see below), whose sum is σ = 220459247253888. Its totient is φ = 110229623626940.

The previous prime is 165344435440367. The next prime is 165344435440427. The reversal of 165344435440413 is 314044534443561.

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 165344435440413 - 2¹⁷ = 165344435309341 is a prime.

It is a super-2 number, since 2×165344435440413² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165344435442413) 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, 27557405906733 + ... + 27557405906738.

It is an arithmetic number, because the mean of its divisors is an integer number (55114811813472).

Almost surely, 2^{165344435440413} is an apocalyptic number.

It is an amenable number.

165344435440413 is a deficient number, since it is larger than the sum of its proper divisors (55114811813475).

165344435440413 is an equidigital number, since it uses as much as digits as its factorization.

165344435440413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55114811813474.

The product of its (nonzero) digits is 16588800, while the sum is 51.

Adding to 165344435440413 its reverse (314044534443561), we get a palindrome (479388969883974).

The spelling of 165344435440413 in words is "one hundred sixty-five trillion, three hundred forty-four billion, four hundred thirty-five million, four hundred forty thousand, four hundred thirteen".