65161216 has 24 divisors (see below), whose sum is σ = 130294710. Its totient is φ = 32579584.

The previous prime is 65161189. The next prime is 65161247. The reversal of 65161216 is 61216156.

It can be written as a sum of positive squares in only one way, i.e., 43033600 + 22127616 = 6560^2 + 4704^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13861 + ... + 17956.

Almost surely, 2^65161216 is an apocalyptic number.

It is an amenable number.

65161216 is a deficient number, since it is larger than the sum of its proper divisors (65133494).

65161216 is an equidigital number, since it uses as much as digits as its factorization.

65161216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31839 (or 31819 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 65161216 is about 8072.2497483663. The cubic root of 65161216 is about 402.4047144016.

The spelling of 65161216 in words is "sixty-five million, one hundred sixty-one thousand, two hundred sixteen".