165665426 has 8 divisors (see below), whose sum is σ = 256514304. Its totient is φ = 80160660.

The previous prime is 165665419. The next prime is 165665431. The reversal of 165665426 is 624566561.

165665426 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×165665426² = 54890066743522952, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 1335950 + ... + 1336073.

It is an arithmetic number, because the mean of its divisors is an integer number (32064288).

Almost surely, 2^165665426 is an apocalyptic number.

165665426 is a deficient number, since it is larger than the sum of its proper divisors (90848878).

165665426 is a wasteful number, since it uses less digits than its factorization.

165665426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2672056.

The product of its digits is 259200, while the sum is 41.

The square root of 165665426 is about 12871.1081884972. The cubic root of 165665426 is about 549.2169860575.

The spelling of 165665426 in words is "one hundred sixty-five million, six hundred sixty-five thousand, four hundred twenty-six".