165955090 has 48 divisors (see below), whose sum is σ = 352904256. Its totient is φ = 55041120.

The previous prime is 165955079. The next prime is 165955093. The reversal of 165955090 is 90559561.

It is not an unprimeable number, because it can be changed into a prime (165955093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66037 + ... + 68503.

It is an arithmetic number, because the mean of its divisors is an integer number (7352172).

Almost surely, 2^165955090 is an apocalyptic number.

165955090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165955090 is an abundant number, since it is smaller than the sum of its proper divisors (186949166).

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

165955090 is a wasteful number, since it uses less digits than its factorization.

165955090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543 (or 2512 counting only the distinct ones).

The product of its (nonzero) digits is 60750, while the sum is 40.

The square root of 165955090 is about 12882.3557628254. The cubic root of 165955090 is about 549.5368994345.

The spelling of 165955090 in words is "one hundred sixty-five million, nine hundred fifty-five thousand, ninety".