165221335 has 8 divisors (see below), whose sum is σ = 198340560. Its totient is φ = 132127104.

The previous prime is 165221333. The next prime is 165221341. The reversal of 165221335 is 533122561.

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

It is a cyclic number.

It is not a de Polignac number, because 165221335 - 2¹ = 165221333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165221333) 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, 14671 + ... + 23359.

It is an arithmetic number, because the mean of its divisors is an integer number (24792570).

Almost surely, 2^165221335 is an apocalyptic number.

165221335 is a deficient number, since it is larger than the sum of its proper divisors (33119225).

165221335 is an equidigital number, since it uses as much as digits as its factorization.

165221335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12497.

The product of its digits is 5400, while the sum is 28.

The square root of 165221335 is about 12853.8451445472. The cubic root of 165221335 is about 548.7257940800.

Adding to 165221335 its reverse (533122561), we get a palindrome (698343896).

The spelling of 165221335 in words is "one hundred sixty-five million, two hundred twenty-one thousand, three hundred thirty-five".