65665729848 has 128 divisors (see below), whose sum is σ = 173482560000. Its totient is φ = 20681912832.

The previous prime is 65665729807. The next prime is 65665729849. The reversal of 65665729848 is 84892756656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65665729849) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9400165 + ... + 9407147.

It is an arithmetic number, because the mean of its divisors is an integer number (1355332500).

Almost surely, 2^65665729848 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 65665729848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86741280000).

65665729848 is an abundant number, since it is smaller than the sum of its proper divisors (107816830152).

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

65665729848 is a wasteful number, since it uses less digits than its factorization.

65665729848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7309 (or 7305 counting only the distinct ones).

The product of its digits is 174182400, while the sum is 66.

The spelling of 65665729848 in words is "sixty-five billion, six hundred sixty-five million, seven hundred twenty-nine thousand, eight hundred forty-eight".