66580561221202 has 48 divisors (see below), whose sum is σ = 117241984440000. Its totient is φ = 28273582268064.

The previous prime is 66580561221193. The next prime is 66580561221203. The reversal of 66580561221202 is 20212216508566.

It is a super-2 number, since 2×66580561221202² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66580561221203) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2132299 + ... + 11734897.

It is an arithmetic number, because the mean of its divisors is an integer number (2442541342500).

Almost surely, 2^{66580561221202} is an apocalyptic number.

66580561221202 is a deficient number, since it is larger than the sum of its proper divisors (50661423218798).

66580561221202 is a wasteful number, since it uses less digits than its factorization.

66580561221202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9603263 (or 9603256 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 46.

Adding to 66580561221202 its reverse (20212216508566), we get a palindrome (86792777729768).

The spelling of 66580561221202 in words is "sixty-six trillion, five hundred eighty billion, five hundred sixty-one million, two hundred twenty-one thousand, two hundred two".