165446553 has 4 divisors (see below), whose sum is σ = 220595408. Its totient is φ = 110297700.

The previous prime is 165446551. The next prime is 165446609. The reversal of 165446553 is 355644561.

165446553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 165446553 - 2¹ = 165446551 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165446551) 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, 27574423 + ... + 27574428.

It is an arithmetic number, because the mean of its divisors is an integer number (55148852).

Almost surely, 2^165446553 is an apocalyptic number.

It is an amenable number.

165446553 is a deficient number, since it is larger than the sum of its proper divisors (55148855).

165446553 is an equidigital number, since it uses as much as digits as its factorization.

165446553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55148854.

The product of its digits is 216000, while the sum is 39.

The square root of 165446553 is about 12862.6028858859. The cubic root of 165446553 is about 548.9750088989.

The spelling of 165446553 in words is "one hundred sixty-five million, four hundred forty-six thousand, five hundred fifty-three".