165465985 has 8 divisors (see below), whose sum is σ = 198686376. Its totient is φ = 132288000.

The previous prime is 165465983. The next prime is 165466001. The reversal of 165465985 is 589564561.

It can be written as a sum of positive squares in 4 ways, for example, as 58384881 + 107081104 = 7641^2 + 10348^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 165465985 - 2¹ = 165465983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165465983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1266 + ... + 18235.

It is an arithmetic number, because the mean of its divisors is an integer number (24835797).

Almost surely, 2^165465985 is an apocalyptic number.

It is an amenable number.

165465985 is a deficient number, since it is larger than the sum of its proper divisors (33220391).

165465985 is a wasteful number, since it uses less digits than its factorization.

165465985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21203.

The product of its digits is 1296000, while the sum is 49.

The square root of 165465985 is about 12863.3582318149. The cubic root of 165465985 is about 548.9965007635.

The spelling of 165465985 in words is "one hundred sixty-five million, four hundred sixty-five thousand, nine hundred eighty-five".