165195890 has 32 divisors (see below), whose sum is σ = 320993280. Its totient is φ = 61023424.

The previous prime is 165195889. The next prime is 165195893. The reversal of 165195890 is 98591561.

Together with 155797390 it forms an amicable pair .

It is not an unprimeable number, because it can be changed into a prime (165195893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5714 + ... + 19053.

It is an arithmetic number, because the mean of its divisors is an integer number (10031040).

Almost surely, 2^165195890 is an apocalyptic number.

165195890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165195890 is a deficient number, since it is larger than the sum of its proper divisors (155797390).

165195890 is a wasteful number, since it uses less digits than its factorization.

165195890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24826.

The product of its (nonzero) digits is 97200, while the sum is 44.

The square root of 165195890 is about 12852.8553247907. The cubic root of 165195890 is about 548.6976236974.

The spelling of 165195890 in words is "one hundred sixty-five million, one hundred ninety-five thousand, eight hundred ninety".