65220615985 has 16 divisors (see below), whose sum is σ = 89652966912. Its totient is φ = 44618932800.

The previous prime is 65220615937. The next prime is 65220615989. The reversal of 65220615985 is 58951602256.

It is a happy number.

It is not a de Polignac number, because 65220615985 - 2¹¹ = 65220613937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65220615989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2146686 + ... + 2176855.

It is an arithmetic number, because the mean of its divisors is an integer number (5603310432).

Almost surely, 2^65220615985 is an apocalyptic number.

It is an amenable number.

65220615985 is a deficient number, since it is larger than the sum of its proper divisors (24432350927).

65220615985 is a wasteful number, since it uses less digits than its factorization.

65220615985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4323984.

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 65220615985 in words is "sixty-five billion, two hundred twenty million, six hundred fifteen thousand, nine hundred eighty-five".