65615667648 has 112 divisors (see below), whose sum is σ = 182879512320. Its totient is φ = 20705531904.

The previous prime is 65615667619. The next prime is 65615667659. The reversal of 65615667648 is 84676651656.

It is a junction number, because it is equal to n+sod(n) for n = 65615667591 and 65615667600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5623036 + ... + 5634692.

Almost surely, 2^65615667648 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 65615667648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91439756160).

65615667648 is an abundant number, since it is smaller than the sum of its proper divisors (117263844672).

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

65615667648 is a wasteful number, since it uses less digits than its factorization.

65615667648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13234 (or 13224 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 60.

The spelling of 65615667648 in words is "sixty-five billion, six hundred fifteen million, six hundred sixty-seven thousand, six hundred forty-eight".