65560820800 has 42 divisors (see below), whose sum is σ = 161320598618. Its totient is φ = 26224327680.

The previous prime is 65560820783. The next prime is 65560820803. The reversal of 65560820800 is 802806556.

65560820800 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 14925020224 + 50635800576 = 122168^2 + 225024^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (65560820803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20486157 + ... + 20489356.

Almost surely, 2^65560820800 is an apocalyptic number.

It is an amenable number.

65560820800 is an abundant number, since it is smaller than the sum of its proper divisors (95759777818).

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

65560820800 is a wasteful number, since it uses less digits than its factorization.

65560820800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40975535 (or 40975520 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 65560820800 in words is "sixty-five billion, five hundred sixty million, eight hundred twenty thousand, eight hundred".