165469945 has 4 divisors (see below), whose sum is σ = 198563940. Its totient is φ = 132375952.

The previous prime is 165469937. The next prime is 165469949. The reversal of 165469945 is 549964561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93779856 + 71690089 = 9684^2 + 8467^2 .

It is a cyclic number.

It is not a de Polignac number, because 165469945 - 2³ = 165469937 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (165469949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16546990 + ... + 16546999.

It is an arithmetic number, because the mean of its divisors is an integer number (49640985).

Almost surely, 2^165469945 is an apocalyptic number.

It is an amenable number.

165469945 is a deficient number, since it is larger than the sum of its proper divisors (33093995).

165469945 is an equidigital number, since it uses as much as digits as its factorization.

165469945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33093994.

The product of its digits is 1166400, while the sum is 49.

The square root of 165469945 is about 12863.5121564835. The cubic root of 165469945 is about 549.0008803319. Note that the first 3 decimals are identical.

The spelling of 165469945 in words is "one hundred sixty-five million, four hundred sixty-nine thousand, nine hundred forty-five".