165808101 has 8 divisors (see below), whose sum is σ = 221231520. Its totient is φ = 110461712.

The previous prime is 165808073. The next prime is 165808133. The reversal of 165808101 is 101808561.

It is a happy number.

165808101 is digitally balanced in base 2, 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 cyclic number.

It is not a de Polignac number, because 165808101 - 2⁷ = 165807973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165800101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14031 + ... + 22988.

It is an arithmetic number, because the mean of its divisors is an integer number (27653940).

Almost surely, 2^165808101 is an apocalyptic number.

It is an amenable number.

165808101 is a deficient number, since it is larger than the sum of its proper divisors (55423419).

165808101 is a wasteful number, since it uses less digits than its factorization.

165808101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38515.

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 165808101 is about 12876.6494477407. The cubic root of 165808101 is about 549.3746070553.

The spelling of 165808101 in words is "one hundred sixty-five million, eight hundred eight thousand, one hundred one".