165395906 has 12 divisors (see below), whose sum is σ = 268646562. Its totient is φ = 76336416.

The previous prime is 165395899. The next prime is 165395911. The reversal of 165395906 is 609593561.

It can be written as a sum of positive squares in 3 ways, for example, as 86025625 + 79370281 = 9275^2 + 8909^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 244331 + ... + 245006.

Almost surely, 2^165395906 is an apocalyptic number.

165395906 is a deficient number, since it is larger than the sum of its proper divisors (103250656).

165395906 is a wasteful number, since it uses less digits than its factorization.

165395906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489365 (or 489352 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 44.

The square root of 165395906 is about 12860.6339657110. The cubic root of 165395906 is about 548.9189852175.

The spelling of 165395906 in words is "one hundred sixty-five million, three hundred ninety-five thousand, nine hundred six".