65220012215620 has 24 divisors (see below), whose sum is σ = 136972114020504. Its totient is φ = 26086083292416.

The previous prime is 65220012215609. The next prime is 65220012215689. The reversal of 65220012215620 is 2651221002256.

It can be written as a sum of positive squares in 4 ways, for example, as 25208593305856 + 40011418909764 = 5020816^2 + 6325458^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119821287 + ... + 120364366.

It is an arithmetic number, because the mean of its divisors is an integer number (5707171417521).

Almost surely, 2^{65220012215620} is an apocalyptic number.

It is an amenable number.

65220012215620 is an abundant number, since it is smaller than the sum of its proper divisors (71752101804884).

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

65220012215620 is a wasteful number, since it uses less digits than its factorization.

65220012215620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240199239 (or 240199237 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 65220012215620 its reverse (2651221002256), we get a palindrome (67871233217876).

The spelling of 65220012215620 in words is "sixty-five trillion, two hundred twenty billion, twelve million, two hundred fifteen thousand, six hundred twenty".