65621445340 has 192 divisors, whose sum is σ = 165276236160. Its totient is φ = 21603778560.

The previous prime is 65621445293. The next prime is 65621445359. The reversal of 65621445340 is 4354412656.

It is a junction number, because it is equal to n+sod(n) for n = 65621445293 and 65621445302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33947014 + ... + 33948946.

It is an arithmetic number, because the mean of its divisors is an integer number (860813730).

Almost surely, 2^65621445340 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 65621445340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82638118080).

65621445340 is an abundant number, since it is smaller than the sum of its proper divisors (99654790820).

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

65621445340 is a wasteful number, since it uses less digits than its factorization.

65621445340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312 (or 2310 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

Adding to 65621445340 its reverse (4354412656), we get a palindrome (69975857996).

The spelling of 65621445340 in words is "sixty-five billion, six hundred twenty-one million, four hundred forty-five thousand, three hundred forty".