66066061986 has 24 divisors (see below), whose sum is σ = 143884816140. Its totient is φ = 21907915776.

The previous prime is 66066061979. The next prime is 66066061987. The reversal of 66066061986 is 68916066066.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 65904644961 + 161417025 = 256719^2 + 12705^2 .

It is not an unprimeable number, because it can be changed into a prime (66066061987) 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, 9505171 + ... + 9512118.

Almost surely, 2^66066061986 is an apocalyptic number.

66066061986 is an abundant number, since it is smaller than the sum of its proper divisors (77818754154).

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

66066061986 is a wasteful number, since it uses less digits than its factorization.

66066061986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19017490 (or 19017487 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 66066061986 in words is "sixty-six billion, sixty-six million, sixty-one thousand, nine hundred eighty-six".