165481603 has 16 divisors (see below), whose sum is σ = 191376640. Its totient is φ = 140162400.

The previous prime is 165481601. The next prime is 165481609. The reversal of 165481603 is 306184561.

It is a happy number.

It is not a de Polignac number, because 165481603 - 2¹ = 165481601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165481601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267028 + ... + 267646.

It is an arithmetic number, because the mean of its divisors is an integer number (11961040).

Almost surely, 2^165481603 is an apocalyptic number.

165481603 is a deficient number, since it is larger than the sum of its proper divisors (25895037).

165481603 is a wasteful number, since it uses less digits than its factorization.

165481603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 165481603 is about 12863.9652906870. The cubic root of 165481603 is about 549.0137731102.

The spelling of 165481603 in words is "one hundred sixty-five million, four hundred eighty-one thousand, six hundred three".