65216720212 has 24 divisors (see below), whose sum is σ = 130448485440. Its totient is φ = 27946799040.

The previous prime is 65216720189. The next prime is 65216720213. The reversal of 65216720212 is 21202761256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65216720213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121287 + ... + 380977.

It is an arithmetic number, because the mean of its divisors is an integer number (5435353560).

Almost surely, 2^65216720212 is an apocalyptic number.

It is an amenable number.

65216720212 is an abundant number, since it is smaller than the sum of its proper divisors (65231765228).

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

65216720212 is a wasteful number, since it uses less digits than its factorization.

65216720212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268671 (or 268669 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 65216720212 in words is "sixty-five billion, two hundred sixteen million, seven hundred twenty thousand, two hundred twelve".