165620106 has 16 divisors (see below), whose sum is σ = 368044800. Its totient is φ = 55206684.

The previous prime is 165620101. The next prime is 165620123. The reversal of 165620106 is 601026561.

It is a happy number.

165620106 is a `hidden beast` number, since 1 + 656 + 2 + 0 + 1 + 0 + 6 = 666.

It is a super-2 number, since 2×165620106² = 54860039022902472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165620106.

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 7 ways as a sum of consecutive naturals, for example, 1533466 + ... + 1533573.

It is an arithmetic number, because the mean of its divisors is an integer number (23002800).

Almost surely, 2^165620106 is an apocalyptic number.

165620106 is an abundant number, since it is smaller than the sum of its proper divisors (202424694).

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

165620106 is a wasteful number, since it uses less digits than its factorization.

165620106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3067050 (or 3067044 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 165620106 is about 12869.3475359087. The cubic root of 165620106 is about 549.1668995982.

Adding to 165620106 its reverse (601026561), we get a palindrome (766646667).

The spelling of 165620106 in words is "one hundred sixty-five million, six hundred twenty thousand, one hundred six".