65520916800 has 168 divisors, whose sum is σ = 215913772896. Its totient is φ = 17394984960.

The previous prime is 65520916751. The next prime is 65520916817. The reversal of 65520916800 is 861902556.

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, 1059534 + ... + 1119666.

Almost surely, 2^65520916800 is an apocalyptic number.

65520916800 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65520916800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107956886448).

65520916800 is an abundant number, since it is smaller than the sum of its proper divisors (150392856096).

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

65520916800 is a wasteful number, since it uses less digits than its factorization.

65520916800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60385 (or 60370 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 65520916800 in words is "sixty-five billion, five hundred twenty million, nine hundred sixteen thousand, eight hundred".