165620107 has 4 divisors (see below), whose sum is σ = 165820720. Its totient is φ = 165419496.

The previous prime is 165620101. The next prime is 165620123. The reversal of 165620107 is 701026561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165620107 - 2³ = 165620099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165620101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99063 + ... + 100720.

It is an arithmetic number, because the mean of its divisors is an integer number (41455180).

Almost surely, 2^165620107 is an apocalyptic number.

165620107 is a deficient number, since it is larger than the sum of its proper divisors (200613).

165620107 is an equidigital number, since it uses as much as digits as its factorization.

165620107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200612.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 165620107 is about 12869.3475747607. The cubic root of 165620107 is about 549.1669007035.

Adding to 165620107 its reverse (701026561), we get a palindrome (866646668).

The spelling of 165620107 in words is "one hundred sixty-five million, six hundred twenty thousand, one hundred seven".