65581322884 has 144 divisors (see below), whose sum is σ = 146816167680. Its totient is φ = 25085491200.

The previous prime is 65581322881. The next prime is 65581322897. The reversal of 65581322884 is 48822318556.

It is a super-2 number, since 2×65581322884² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65581322881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81064272 + ... + 81065080.

It is an arithmetic number, because the mean of its divisors is an integer number (1019556720).

Almost surely, 2^65581322884 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 65581322884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73408083840).

65581322884 is an abundant number, since it is smaller than the sum of its proper divisors (81234844796).

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

65581322884 is a wasteful number, since it uses less digits than its factorization.

65581322884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250 (or 1237 counting only the distinct ones).

The product of its digits is 3686400, while the sum is 52.

The spelling of 65581322884 in words is "sixty-five billion, five hundred eighty-one million, three hundred twenty-two thousand, eight hundred eighty-four".