65564940800 has 120 divisors (see below), whose sum is σ = 169505731296. Its totient is φ = 25085603840.

The previous prime is 65564940743. The next prime is 65564940803. The reversal of 65564940800 is 804946556.

It is a super-2 number, since 2×65564940800² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65564940803) 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 11 ways as a sum of consecutive naturals, for example, 183047 + ... + 405753.

Almost surely, 2^65564940800 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 65564940800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84752865648).

65564940800 is an abundant number, since it is smaller than the sum of its proper divisors (103940790496).

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

65564940800 is a wasteful number, since it uses less digits than its factorization.

65564940800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222758 (or 222737 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 47.

The spelling of 65564940800 in words is "sixty-five billion, five hundred sixty-four million, nine hundred forty thousand, eight hundred".