165818745 has 20 divisors (see below), whose sum is σ = 297246180. Its totient is φ = 88436448.

The previous prime is 165818743. The next prime is 165818747. The reversal of 165818745 is 547818561.

165818745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (165818743) and next prime (165818747).

It can be written as a sum of positive squares in 2 ways, for example, as 48399849 + 117418896 = 6957^2 + 10836^2 .

It is not a de Polignac number, because 165818745 - 2¹ = 165818743 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165818745.

It is not an unprimeable number, because it can be changed into a prime (165818743) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 204310 + ... + 205119.

It is an arithmetic number, because the mean of its divisors is an integer number (14862309).

Almost surely, 2^165818745 is an apocalyptic number.

165818745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165818745 is a deficient number, since it is larger than the sum of its proper divisors (131427435).

165818745 is an equidigital number, since it uses as much as digits as its factorization.

165818745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409446 (or 409437 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 165818745 is about 12877.0627473815. The cubic root of 165818745 is about 549.3863624483.

The spelling of 165818745 in words is "one hundred sixty-five million, eight hundred eighteen thousand, seven hundred forty-five".