165448561 has 8 divisors (see below), whose sum is σ = 174298880. Its totient is φ = 156612528.

The previous prime is 165448553. The next prime is 165448583. The reversal of 165448561 is 165844561.

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 165448561 - 2³ = 165448553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165448501) 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, 26995 + ... + 32551.

It is an arithmetic number, because the mean of its divisors is an integer number (21787360).

Almost surely, 2^165448561 is an apocalyptic number.

It is an amenable number.

165448561 is a deficient number, since it is larger than the sum of its proper divisors (8850319).

165448561 is a wasteful number, since it uses less digits than its factorization.

165448561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7143.

The product of its digits is 115200, while the sum is 40.

The square root of 165448561 is about 12862.6809413901. The cubic root of 165448561 is about 548.9772298323.

The spelling of 165448561 in words is "one hundred sixty-five million, four hundred forty-eight thousand, five hundred sixty-one".