65311515648 has 220 divisors, whose sum is σ = 205302800560. Its totient is φ = 20624191488.

The previous prime is 65311515631. The next prime is 65311515649. The reversal of 65311515648 is 84651511356.

It is a happy number.

65311515648 is a `hidden beast` number, since 6 + 5 + 31 + 1 + 51 + 564 + 8 = 666.

It is a super-3 number, since 3×65311515648³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (65311515649) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1555215 + ... + 1596657.

It is an arithmetic number, because the mean of its divisors is an integer number (933194548).

Almost surely, 2^65311515648 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 65311515648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102651400280).

65311515648 is an abundant number, since it is smaller than the sum of its proper divisors (139991284912).

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

65311515648 is a wasteful number, since it uses less digits than its factorization.

65311515648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41494 (or 41467 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The spelling of 65311515648 in words is "sixty-five billion, three hundred eleven million, five hundred fifteen thousand, six hundred forty-eight".