65563706880 has 800 divisors, whose sum is σ = 284269144896. Its totient is φ = 14099152896.

The previous prime is 65563706851. The next prime is 65563706881. The reversal of 65563706880 is 8860736556.

65563706880 is a `hidden beast` number, since 6 + 5 + 563 + 70 + 6 + 8 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65563706881) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 24674512 + ... + 24677168.

Almost surely, 2^65563706880 is an apocalyptic number.

65563706880 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 65563706880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142134572448).

65563706880 is an abundant number, since it is smaller than the sum of its proper divisors (218705438016).

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

65563706880 is a wasteful number, since it uses less digits than its factorization.

65563706880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716 (or 2691 counting only the distinct ones).

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

The spelling of 65563706880 in words is "sixty-five billion, five hundred sixty-three million, seven hundred six thousand, eight hundred eighty".