1201660165 has 4 divisors (see below), whose sum is σ = 1441992204. Its totient is φ = 961328128.

The previous prime is 1201660133. The next prime is 1201660177. The reversal of 1201660165 is 5610661021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 889113124 + 312547041 = 29818^2 + 17679^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201660165 - 2⁵ = 1201660133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120166012 + ... + 120166021.

It is an arithmetic number, because the mean of its divisors is an integer number (360498051).

Almost surely, 2^1201660165 is an apocalyptic number.

It is an amenable number.

1201660165 is a deficient number, since it is larger than the sum of its proper divisors (240332039).

1201660165 is an equidigital number, since it uses as much as digits as its factorization.

1201660165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240332038.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1201660165 is about 34664.9702870203. The cubic root of 1201660165 is about 1063.1483957438.

The spelling of 1201660165 in words is "one billion, two hundred one million, six hundred sixty thousand, one hundred sixty-five".