165403608441 has 4 divisors (see below), whose sum is σ = 220538144592. Its totient is φ = 110269072292.

The previous prime is 165403608413. The next prime is 165403608443. The reversal of 165403608441 is 144806304561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 144806304561 = 3 ⋅48268768187.

It is a cyclic number.

It is not a de Polignac number, because 165403608441 - 2¹¹ = 165403606393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165403608393 and 165403608402.

It is not an unprimeable number, because it can be changed into a prime (165403608443) 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, 27567268071 + ... + 27567268076.

It is an arithmetic number, because the mean of its divisors is an integer number (55134536148).

Almost surely, 2^165403608441 is an apocalyptic number.

It is an amenable number.

165403608441 is a deficient number, since it is larger than the sum of its proper divisors (55134536151).

165403608441 is an equidigital number, since it uses as much as digits as its factorization.

165403608441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55134536150.

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 165403608441 in words is "one hundred sixty-five billion, four hundred three million, six hundred eight thousand, four hundred forty-one".