165446665 has 8 divisors (see below), whose sum is σ = 198616968. Its totient is φ = 132303360.

The previous prime is 165446663. The next prime is 165446693. The reversal of 165446665 is 566644561.

It can be written as a sum of positive squares in 4 ways, for example, as 16289296 + 149157369 = 4036^2 + 12213^2 .

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

It is not a de Polignac number, because 165446665 - 2¹ = 165446663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165446663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10969 + ... + 21241.

It is an arithmetic number, because the mean of its divisors is an integer number (24827121).

Almost surely, 2^165446665 is an apocalyptic number.

It is an amenable number.

165446665 is a deficient number, since it is larger than the sum of its proper divisors (33170303).

165446665 is a wasteful number, since it uses less digits than its factorization.

165446665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13499.

The product of its digits is 518400, while the sum is 43.

The square root of 165446665 is about 12862.6072395918. The cubic root of 165446665 is about 548.9751327761.

The spelling of 165446665 in words is "one hundred sixty-five million, four hundred forty-six thousand, six hundred sixty-five".