165401103 has 16 divisors (see below), whose sum is σ = 255591936. Its totient is φ = 93182880.

The previous prime is 165401083. The next prime is 165401113. The reversal of 165401103 is 301104561.

It is not a de Polignac number, because 165401103 - 2⁹ = 165400591 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 165401103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165401113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53976 + ... + 56957.

It is an arithmetic number, because the mean of its divisors is an integer number (15974496).

Almost surely, 2^165401103 is an apocalyptic number.

165401103 is a deficient number, since it is larger than the sum of its proper divisors (90190833).

165401103 is a wasteful number, since it uses less digits than its factorization.

165401103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111014.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 165401103 is about 12860.8360148165. The cubic root of 165401103 is about 548.9247344571.

Adding to 165401103 its reverse (301104561), we get a palindrome (466505664).

The spelling of 165401103 in words is "one hundred sixty-five million, four hundred one thousand, one hundred three".