165403103 has 4 divisors (see below), whose sum is σ = 165441360. Its totient is φ = 165364848.

The previous prime is 165403093. The next prime is 165403127. The reversal of 165403103 is 301304561.

It is a happy number.

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 165403103 - 2⁴ = 165403087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165403193) 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, 11675 + ... + 21612.

It is an arithmetic number, because the mean of its divisors is an integer number (41360340).

Almost surely, 2^165403103 is an apocalyptic number.

165403103 is a deficient number, since it is larger than the sum of its proper divisors (38257).

165403103 is an equidigital number, since it uses as much as digits as its factorization.

165403103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38256.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 165403103 is about 12860.9137700243. The cubic root of 165403103 is about 548.9269469475.

Adding to 165403103 its reverse (301304561), we get a palindrome (466707664).

The spelling of 165403103 in words is "one hundred sixty-five million, four hundred three thousand, one hundred three".