165216446 has 4 divisors (see below), whose sum is σ = 247824672. Its totient is φ = 82608222.

The previous prime is 165216437. The next prime is 165216481. The reversal of 165216446 is 644612561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 644612561 = 67 ⋅9621083.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41304110 + ... + 41304113.

It is an arithmetic number, because the mean of its divisors is an integer number (61956168).

Almost surely, 2^165216446 is an apocalyptic number.

165216446 is a deficient number, since it is larger than the sum of its proper divisors (82608226).

165216446 is an equidigital number, since it uses as much as digits as its factorization.

165216446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82608225.

The product of its digits is 34560, while the sum is 35.

The square root of 165216446 is about 12853.6549665844. The cubic root of 165216446 is about 548.7203816497.

The spelling of 165216446 in words is "one hundred sixty-five million, two hundred sixteen thousand, four hundred forty-six".