165520145 has 16 divisors (see below), whose sum is σ = 230723328. Its totient is φ = 111637440.

The previous prime is 165520133. The next prime is 165520151. The reversal of 165520145 is 541025561.

It is a happy number.

165520145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 165520145 - 2¹⁰ = 165519121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36629 + ... + 40898.

It is an arithmetic number, because the mean of its divisors is an integer number (14420208).

Almost surely, 2^165520145 is an apocalyptic number.

It is an amenable number.

165520145 is a deficient number, since it is larger than the sum of its proper divisors (65203183).

165520145 is an equidigital number, since it uses as much as digits as its factorization.

165520145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77600.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 165520145 is about 12865.4632641036. The cubic root of 165520145 is about 549.0563930468.

The spelling of 165520145 in words is "one hundred sixty-five million, five hundred twenty thousand, one hundred forty-five".