66066061988 has 6 divisors (see below), whose sum is σ = 115615608486. Its totient is φ = 33033030992.

The previous prime is 66066061987. The next prime is 66066062053. The reversal of 66066061988 is 88916066066.

It can be written as a sum of positive squares in only one way, i.e., 54939609664 + 11126452324 = 234392^2 + 105482^2 .

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 as a sum of consecutive naturals, namely, 8258257745 + ... + 8258257752.

It is an arithmetic number, because the mean of its divisors is an integer number (19269268081).

Almost surely, 2^66066061988 is an apocalyptic number.

It is an amenable number.

66066061988 is a deficient number, since it is larger than the sum of its proper divisors (49549546498).

66066061988 is a wasteful number, since it uses less digits than its factorization.

66066061988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16516515501 (or 16516515499 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 66066061988 in words is "sixty-six billion, sixty-six million, sixty-one thousand, nine hundred eighty-eight".