165243239213 has 8 divisors (see below), whose sum is σ = 178937432856. Its totient is φ = 151689499200.

The previous prime is 165243239207. The next prime is 165243239233. The reversal of 165243239213 is 312932342561.

It can be written as a sum of positive squares in 4 ways, for example, as 22768697449 + 142474541764 = 150893^2 + 377458^2 .

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 165243239213 - 2⁶ = 165243239149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165243239233) 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, 35110958 + ... + 35115663.

It is an arithmetic number, because the mean of its divisors is an integer number (22367179107).

Almost surely, 2^165243239213 is an apocalyptic number.

165243239213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

165243239213 is a deficient number, since it is larger than the sum of its proper divisors (13694193643).

165243239213 is a wasteful number, since it uses less digits than its factorization.

165243239213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70226815.

The product of its digits is 233280, while the sum is 41.

The spelling of 165243239213 in words is "one hundred sixty-five billion, two hundred forty-three million, two hundred thirty-nine thousand, two hundred thirteen".