65261220664120 has 64 divisors (see below), whose sum is σ = 158230996348320. Its totient is φ = 24081511494144.

The previous prime is 65261220664067. The next prime is 65261220664139. The reversal of 65261220664120 is 2146602216256.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38064634 + ... + 39742153.

Almost surely, 2^{65261220664120} is an apocalyptic number.

It is an amenable number.

65261220664120 is an abundant number, since it is smaller than the sum of its proper divisors (92969775684200).

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

65261220664120 is a wasteful number, since it uses less digits than its factorization.

65261220664120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77808424 (or 77808420 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 65261220664120 in words is "sixty-five trillion, two hundred sixty-one billion, two hundred twenty million, six hundred sixty-four thousand, one hundred twenty".