65516816 has 40 divisors (see below), whose sum is σ = 129679200. Its totient is φ = 32060160.

The previous prime is 65516809. The next prime is 65516819. The reversal of 65516816 is 61861556.

It is a self number, because there is not a number n which added to its sum of digits gives 65516816.

It is not an unprimeable number, because it can be changed into a prime (65516819) 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, 197771 + ... + 198101.

It is an arithmetic number, because the mean of its divisors is an integer number (3241980).

Almost surely, 2^65516816 is an apocalyptic number.

It is an amenable number.

65516816 is a deficient number, since it is larger than the sum of its proper divisors (64162384).

65516816 is a wasteful number, since it uses less digits than its factorization.

65516816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567 (or 561 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 65516816 is about 8094.2458573977. The cubic root of 65516816 is about 403.1353924048.

It can be divided in two parts, 655 and 16816, that added together give a palindrome (17471).

The spelling of 65516816 in words is "sixty-five million, five hundred sixteen thousand, eight hundred sixteen".