165910890 has 16 divisors (see below), whose sum is σ = 398186208. Its totient is φ = 44242896.

The previous prime is 165910867. The next prime is 165910903. The reversal of 165910890 is 98019561.

165910890 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

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, 2765152 + ... + 2765211.

It is an arithmetic number, because the mean of its divisors is an integer number (24886638).

Almost surely, 2^165910890 is an apocalyptic number.

165910890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165910890 is an abundant number, since it is smaller than the sum of its proper divisors (232275318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165910890 is a wasteful number, since it uses less digits than its factorization.

165910890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530373.

The product of its (nonzero) digits is 19440, while the sum is 39.

The square root of 165910890 is about 12880.6401238448. The cubic root of 165910890 is about 549.4881077450.

The spelling of 165910890 in words is "one hundred sixty-five million, nine hundred ten thousand, eight hundred ninety".