65683531872 has 144 divisors (see below), whose sum is σ = 213767517600. Its totient is φ = 18740699136.

The previous prime is 65683531853. The next prime is 65683531889. The reversal of 65683531872 is 27813538656.

65683531872 is a `hidden beast` number, since 6 + 568 + 3 + 5 + 3 + 1 + 8 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1455504 + ... + 1499952.

It is an arithmetic number, because the mean of its divisors is an integer number (1484496650).

Almost surely, 2^65683531872 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 65683531872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106883758800).

65683531872 is an abundant number, since it is smaller than the sum of its proper divisors (148083985728).

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

65683531872 is a wasteful number, since it uses less digits than its factorization.

65683531872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45205 (or 45194 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The spelling of 65683531872 in words is "sixty-five billion, six hundred eighty-three million, five hundred thirty-one thousand, eight hundred seventy-two".