6660986 has 4 divisors (see below), whose sum is σ = 9991482. Its totient is φ = 3330492.

The previous prime is 6660977. The next prime is 6661013. The reversal of 6660986 is 6890666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6405961 + 255025 = 2531^2 + 505^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665245 + ... + 1665248.

Almost surely, 2^6660986 is an apocalyptic number.

6660986 is a deficient number, since it is larger than the sum of its proper divisors (3330496).

6660986 is a wasteful number, since it uses less digits than its factorization.

6660986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3330495.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 6660986 is about 2580.8886066624. Note that the first 3 decimals coincide. The cubic root of 6660986 is about 188.1537334654.

The spelling of 6660986 in words is "six million, six hundred sixty thousand, nine hundred eighty-six".