165401003 has 4 divisors (see below), whose sum is σ = 166240800. Its totient is φ = 164561208.

The previous prime is 165400997. The next prime is 165401009. The reversal of 165401003 is 300104561.

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

It is an interprime number because it is at equal distance from previous prime (165400997) and next prime (165401009).

It is a cyclic number.

It is not a de Polignac number, because 165401003 - 2²⁰ = 164352427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165401009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419603 + ... + 419996.

It is an arithmetic number, because the mean of its divisors is an integer number (41560200).

Almost surely, 2^165401003 is an apocalyptic number.

165401003 is a deficient number, since it is larger than the sum of its proper divisors (839797).

165401003 is an equidigital number, since it uses as much as digits as its factorization.

165401003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839796.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 165401003 is about 12860.8321270437. The cubic root of 165401003 is about 548.9246238321.

Adding to 165401003 its reverse (300104561), we get a palindrome (465505564).

The spelling of 165401003 in words is "one hundred sixty-five million, four hundred one thousand, three".