66988966 has 16 divisors (see below), whose sum is σ = 109744128. Its totient is φ = 30414600.

The previous prime is 66988963. The next prime is 66988967.

66988966 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66988966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66988963) 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 7 ways as a sum of consecutive naturals, for example, 35671 + ... + 37501.

It is an arithmetic number, because the mean of its divisors is an integer number (6859008).

Almost surely, 2^66988966 is an apocalyptic number.

66988966 is a deficient number, since it is larger than the sum of its proper divisors (42755162).

66988966 is a wasteful number, since it uses less digits than its factorization.

66988966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507.

The product of its digits is 6718464, while the sum is 58.

The square root of 66988966 is about 8184.6787352956. The cubic root of 66988966 is about 406.1325127400.

The spelling of 66988966 in words is "sixty-six million, nine hundred eighty-eight thousand, nine hundred sixty-six".