165422225 has 12 divisors (see below), whose sum is σ = 205319820. Its totient is φ = 132211200.

The previous prime is 165422203. The next prime is 165422251. The reversal of 165422225 is 522224561.

It can be written as a sum of positive squares in 6 ways, for example, as 1607824 + 163814401 = 1268^2 + 12799^2 .

It is a de Polignac number, because none of the positive numbers 2^k-165422225 is a prime.

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, 30521 + ... + 35529.

It is an arithmetic number, because the mean of its divisors is an integer number (17109985).

Almost surely, 2^165422225 is an apocalyptic number.

It is an amenable number.

165422225 is a deficient number, since it is larger than the sum of its proper divisors (39897595).

165422225 is a wasteful number, since it uses less digits than its factorization.

165422225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6340 (or 6335 counting only the distinct ones).

The product of its digits is 9600, while the sum is 29.

The square root of 165422225 is about 12861.6571638339. The cubic root of 165422225 is about 548.9480996676.

Adding to 165422225 its reverse (522224561), we get a palindrome (687646786).

The spelling of 165422225 in words is "one hundred sixty-five million, four hundred twenty-two thousand, two hundred twenty-five".