65505649136 has 80 divisors (see below), whose sum is σ = 138041164800. Its totient is φ = 29998771200.

The previous prime is 65505649133. The next prime is 65505649141. The reversal of 65505649136 is 63194650556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65505649133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11862056 + ... + 11867576.

It is an arithmetic number, because the mean of its divisors is an integer number (1725514560).

Almost surely, 2^65505649136 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 65505649136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69020582400).

65505649136 is an abundant number, since it is smaller than the sum of its proper divisors (72535515664).

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

65505649136 is a wasteful number, since it uses less digits than its factorization.

65505649136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6838 (or 6832 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 50.

The spelling of 65505649136 in words is "sixty-five billion, five hundred five million, six hundred forty-nine thousand, one hundred thirty-six".