165142225 has 12 divisors (see below), whose sum is σ = 205367436. Its totient is φ = 131732480.

The previous prime is 165142193. The next prime is 165142247. The reversal of 165142225 is 522241561.

It can be written as a sum of positive squares in 6 ways, for example, as 173889 + 164968336 = 417^2 + 12844^2 .

It is not a de Polignac number, because 165142225 - 2⁵ = 165142193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165142193 and 165142202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 532 + ... + 18181.

It is an arithmetic number, because the mean of its divisors is an integer number (17113953).

Almost surely, 2^165142225 is an apocalyptic number.

It is an amenable number.

165142225 is a deficient number, since it is larger than the sum of its proper divisors (40225211).

165142225 is a wasteful number, since it uses less digits than its factorization.

165142225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19076 (or 19071 counting only the distinct ones).

The product of its digits is 4800, while the sum is 28.

The square root of 165142225 is about 12850.7674868079. The cubic root of 165142225 is about 548.6382012200.

Adding to 165142225 its reverse (522241561), we get a palindrome (687383786).

The spelling of 165142225 in words is "one hundred sixty-five million, one hundred forty-two thousand, two hundred twenty-five".