660986 has 8 divisors (see below), whose sum is σ = 997920. Its totient is φ = 328348.

The previous prime is 660983. The next prime is 661009. The reversal of 660986 is 689066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660986.

It is not an unprimeable number, because it can be changed into a prime (660983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656 + ... + 1323.

It is an arithmetic number, because the mean of its divisors is an integer number (124740).

2⁶⁶⁰⁹⁸⁶ is an apocalyptic number.

660986 is a deficient number, since it is larger than the sum of its proper divisors (336934).

660986 is a wasteful number, since it uses less digits than its factorization.

660986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 660986 is about 813.0104550373. The cubic root of 660986 is about 87.1092123865.

The spelling of 660986 in words is "six hundred sixty thousand, nine hundred eighty-six".