66586215644650 has 192 divisors, whose sum is σ = 140241595963392. Its totient is φ = 23351587200000.

The previous prime is 66586215644639. The next prime is 66586215644651. The reversal of 66586215644650 is 5644651268566.

It is a happy number.

It is a super-2 number, since 2×66586215644650² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66586215644651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 566579395 + ... + 566696905.

It is an arithmetic number, because the mean of its divisors is an integer number (730424978976).

Almost surely, 2^{66586215644650} is an apocalyptic number.

66586215644650 is an abundant number, since it is smaller than the sum of its proper divisors (73655380318742).

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

66586215644650 is a wasteful number, since it uses less digits than its factorization.

66586215644650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118089 (or 118084 counting only the distinct ones).

The product of its (nonzero) digits is 248832000, while the sum is 64.

The spelling of 66586215644650 in words is "sixty-six trillion, five hundred eighty-six billion, two hundred fifteen million, six hundred forty-four thousand, six hundred fifty".