165660355 has 16 divisors (see below), whose sum is σ = 227681280. Its totient is φ = 113350752.

The previous prime is 165660353. The next prime is 165660361. The reversal of 165660355 is 553066561.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 165660355 - 2¹ = 165660353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165660353) 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 15 ways as a sum of consecutive naturals, for example, 12186 + ... + 21904.

It is an arithmetic number, because the mean of its divisors is an integer number (14230080).

Almost surely, 2^165660355 is an apocalyptic number.

165660355 is a deficient number, since it is larger than the sum of its proper divisors (62020925).

165660355 is an equidigital number, since it uses as much as digits as its factorization.

165660355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10218.

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 165660355 is about 12870.9111954049. The cubic root of 165660355 is about 549.2113821770.

The spelling of 165660355 in words is "one hundred sixty-five million, six hundred sixty thousand, three hundred fifty-five".