165208089 has 4 divisors (see below), whose sum is σ = 220277456. Its totient is φ = 110138724.

The previous prime is 165208079. The next prime is 165208093. The reversal of 165208089 is 980802561.

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: 980802561 = 3 ⋅326934187.

It is not a de Polignac number, because 165208089 - 2⁴ = 165208073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165208079) 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, 27534679 + ... + 27534684.

It is an arithmetic number, because the mean of its divisors is an integer number (55069364).

Almost surely, 2^165208089 is an apocalyptic number.

It is an amenable number.

165208089 is a deficient number, since it is larger than the sum of its proper divisors (55069367).

165208089 is an equidigital number, since it uses as much as digits as its factorization.

165208089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55069366.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 165208089 is about 12853.3298798405. The cubic root of 165208089 is about 548.7111296782.

The spelling of 165208089 in words is "one hundred sixty-five million, two hundred eight thousand, eighty-nine".