165257216 has 28 divisors (see below), whose sum is σ = 330510642. Its totient is φ = 82624512.

The previous prime is 165257203. The next prime is 165257219. The reversal of 165257216 is 612752561.

It can be written as a sum of positive squares in only one way, i.e., 86118400 + 79138816 = 9280^2 + 8896^2 .

It is not an unprimeable number, because it can be changed into a prime (165257219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1895 + ... + 18278.

Almost surely, 2^165257216 is an apocalyptic number.

165257216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

165257216 is a deficient number, since it is larger than the sum of its proper divisors (165253426).

165257216 is an frugal number, since it uses more digits than its factorization.

165257216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20199 (or 20175 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

The square root of 165257216 is about 12855.2407989893. The cubic root of 165257216 is about 548.7655133352.

The spelling of 165257216 in words is "one hundred sixty-five million, two hundred fifty-seven thousand, two hundred sixteen".