165304385 has 4 divisors (see below), whose sum is σ = 198365268. Its totient is φ = 132243504.

The previous prime is 165304357. The next prime is 165304409. The reversal of 165304385 is 583403561.

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 58967041 + 106337344 = 7679^2 + 10312^2 .

It is a cyclic number.

It is not a de Polignac number, because 165304385 - 2⁸ = 165304129 is a prime.

It is a Duffinian number.

It is a Curzon 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, 16530434 + ... + 16530443.

It is an arithmetic number, because the mean of its divisors is an integer number (49591317).

Almost surely, 2^165304385 is an apocalyptic number.

It is an amenable number.

165304385 is a deficient number, since it is larger than the sum of its proper divisors (33060883).

165304385 is an equidigital number, since it uses as much as digits as its factorization.

165304385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33060882.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 165304385 is about 12857.0752895050. The cubic root of 165304385 is about 548.8177193423.

The spelling of 165304385 in words is "one hundred sixty-five million, three hundred four thousand, three hundred eighty-five".