65216512 has 56 divisors (see below), whose sum is σ = 137617200. Its totient is φ = 30818304.

The previous prime is 65216497. The next prime is 65216519. The reversal of 65216512 is 21561256.

It is a super-2 number, since 2×65216512² = 8506386874892288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65216519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155439 + ... + 155857.

It is an arithmetic number, because the mean of its divisors is an integer number (2457450).

Almost surely, 2^65216512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65216512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68808600).

65216512 is an abundant number, since it is smaller than the sum of its proper divisors (72400688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65216512 is an equidigital number, since it uses as much as digits as its factorization.

65216512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464 (or 440 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 65216512 is about 8075.6740895110. The cubic root of 65216512 is about 402.5185094943.

Adding to 65216512 its reverse (21561256), we get a palindrome (86777768).

The spelling of 65216512 in words is "sixty-five million, two hundred sixteen thousand, five hundred twelve".