165833338561 has 4 divisors (see below), whose sum is σ = 180909096624. Its totient is φ = 150757580500.

The previous prime is 165833338553. The next prime is 165833338577.

165833338561 is nontrivially palindromic in base 10.

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 165833338561 - 2³ = 165833338553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165833338499 and 165833338508.

It is not an unprimeable number, because it can be changed into a prime (165833338511) 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, 7537879015 + ... + 7537879036.

It is an arithmetic number, because the mean of its divisors is an integer number (45227274156).

Almost surely, 2^165833338561 is an apocalyptic number.

165833338561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165833338561 is a deficient number, since it is larger than the sum of its proper divisors (15075758063).

165833338561 is a wasteful number, since it uses less digits than its factorization.

165833338561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15075758062.

The product of its digits is 4665600, while the sum is 52.

The spelling of 165833338561 in words is "one hundred sixty-five billion, eight hundred thirty-three million, three hundred thirty-eight thousand, five hundred sixty-one".