66708986 has 16 divisors (see below), whose sum is σ = 106632936. Its totient is φ = 31190016.

The previous prime is 66708977. The next prime is 66708989. The reversal of 66708986 is 68980766.

It can be written as a sum of positive squares in 4 ways, for example, as 59521225 + 7187761 = 7715^2 + 2681^2 .

It is not an unprimeable number, because it can be changed into a prime (66708989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 911 + ... + 11586.

Almost surely, 2^66708986 is an apocalyptic number.

66708986 is a deficient number, since it is larger than the sum of its proper divisors (39923950).

66708986 is a wasteful number, since it uses less digits than its factorization.

66708986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12673.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 66708986 is about 8167.5569174631. The cubic root of 66708986 is about 405.5659131346.

The spelling of 66708986 in words is "sixty-six million, seven hundred eight thousand, nine hundred eighty-six".