65205271688 has 12 divisors (see below), whose sum is σ = 122261238645. Its totient is φ = 32602274720.

The previous prime is 65205271679. The next prime is 65205271727. The reversal of 65205271688 is 88617250256.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

65205271688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 65085193924 + 120077764 = 255118^2 + 10958^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=180562.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 677108 + ... + 767388.

Almost surely, 2^65205271688 is an apocalyptic number.

It is an amenable number.

65205271688 is a deficient number, since it is larger than the sum of its proper divisors (57055966957).

65205271688 is an frugal number, since it uses more digits than its factorization.

65205271688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180568 (or 90283 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 50.

Multiplying 65205271688 by its sum of digits (50), we get a square (3260263584400 = 1805620²).

The spelling of 65205271688 in words is "sixty-five billion, two hundred five million, two hundred seventy-one thousand, six hundred eighty-eight".