165621214 has 32 divisors (see below), whose sum is σ = 288178560. Its totient is φ = 70596000.

The previous prime is 165621193. The next prime is 165621217. The reversal of 165621214 is 412126561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165621217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40257 + ... + 44179.

It is an arithmetic number, because the mean of its divisors is an integer number (9005580).

Almost surely, 2^165621214 is an apocalyptic number.

165621214 is a deficient number, since it is larger than the sum of its proper divisors (122557346).

165621214 is a wasteful number, since it uses less digits than its factorization.

165621214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4056.

The product of its digits is 2880, while the sum is 28.

The square root of 165621214 is about 12869.3905838622. The cubic root of 165621214 is about 549.1681242393.

Adding to 165621214 its reverse (412126561), we get a palindrome (577747775).

The spelling of 165621214 in words is "one hundred sixty-five million, six hundred twenty-one thousand, two hundred fourteen".