65265647616 has 540 divisors, whose sum is σ = 213902189592. Its totient is φ = 19874709504.

The previous prime is 65265647593. The next prime is 65265647621. The reversal of 65265647616 is 61674656256.

65265647616 is a `hidden beast` number, since 6 + 5 + 2 + 6 + 564 + 76 + 1 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 672841680 + ... + 672841776.

Almost surely, 2^65265647616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65265647616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106951094796).

65265647616 is an abundant number, since it is smaller than the sum of its proper divisors (148636541976).

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

65265647616 is an frugal number, since it uses more digits than its factorization.

65265647616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 115 counting only the distinct ones).

The product of its digits is 10886400, while the sum is 54.

The spelling of 65265647616 in words is "sixty-five billion, two hundred sixty-five million, six hundred forty-seven thousand, six hundred sixteen".