165103661 has 4 divisors (see below), whose sum is σ = 165130524. Its totient is φ = 165076800.

The previous prime is 165103651. The next prime is 165103663. The reversal of 165103661 is 166301561.

165103661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166301561 = 179 ⋅929059.

It can be written as a sum of positive squares in 2 ways, for example, as 115132900 + 49970761 = 10730^2 + 7069^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165103661 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 (165103663) 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, 851 + ... + 18191.

It is an arithmetic number, because the mean of its divisors is an integer number (41282631).

Almost surely, 2^165103661 is an apocalyptic number.

It is an amenable number.

165103661 is a deficient number, since it is larger than the sum of its proper divisors (26863).

165103661 is an equidigital number, since it uses as much as digits as its factorization.

165103661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26862.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 165103661 is about 12849.2669440712. The cubic root of 165103661 is about 548.5954919115.

The spelling of 165103661 in words is "one hundred sixty-five million, one hundred three thousand, six hundred sixty-one".