165021226 has 16 divisors (see below), whose sum is σ = 252124488. Its totient is φ = 80985600.

The previous prime is 165021209. The next prime is 165021239. The reversal of 165021226 is 622120561.

It can be written as a sum of positive squares in 4 ways, for example, as 114597025 + 50424201 = 10705^2 + 7101^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 165021226.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71206 + ... + 73486.

Almost surely, 2^165021226 is an apocalyptic number.

165021226 is a deficient number, since it is larger than the sum of its proper divisors (87103262).

165021226 is a wasteful number, since it uses less digits than its factorization.

165021226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2937.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 165021226 is about 12846.0587730245. The cubic root of 165021226 is about 548.5041735285.

Adding to 165021226 its reverse (622120561), we get a palindrome (787141787).

The spelling of 165021226 in words is "one hundred sixty-five million, twenty-one thousand, two hundred twenty-six".