66205856652 has 96 divisors (see below), whose sum is σ = 176642726400. Its totient is φ = 19119055872.

The previous prime is 66205856641. The next prime is 66205856719. The reversal of 66205856652 is 25665850266.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 66205856595 and 66205856604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 917299 + ... + 986837.

It is an arithmetic number, because the mean of its divisors is an integer number (1840028400).

Almost surely, 2^66205856652 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 66205856652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88321363200).

66205856652 is an abundant number, since it is smaller than the sum of its proper divisors (110436869748).

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

66205856652 is a wasteful number, since it uses less digits than its factorization.

66205856652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69935 (or 69933 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 51.

The spelling of 66205856652 in words is "sixty-six billion, two hundred five million, eight hundred fifty-six thousand, six hundred fifty-two".