165125549 has 4 divisors (see below), whose sum is σ = 165300864. Its totient is φ = 164950236.

The previous prime is 165125537. The next prime is 165125567. The reversal of 165125549 is 945521561.

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: 945521561 = 223 ⋅4240007.

It is a cyclic number.

It is not a de Polignac number, because 165125549 - 2⁸ = 165125293 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165125509) 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, 86237 + ... + 88130.

It is an arithmetic number, because the mean of its divisors is an integer number (41325216).

Almost surely, 2^165125549 is an apocalyptic number.

It is an amenable number.

165125549 is a deficient number, since it is larger than the sum of its proper divisors (175315).

165125549 is an equidigital number, since it uses as much as digits as its factorization.

165125549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175314.

The product of its digits is 54000, while the sum is 38.

The square root of 165125549 is about 12850.1186375846. The cubic root of 165125549 is about 548.6197335051.

The spelling of 165125549 in words is "one hundred sixty-five million, one hundred twenty-five thousand, five hundred forty-nine".