660997 has 8 divisors (see below), whose sum is σ = 714240. Its totient is φ = 609840.

The previous prime is 660983. The next prime is 661009. The reversal of 660997 is 799066.

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

It is a cyclic number.

It is not a de Polignac number, because 660997 - 2¹⁹ = 136709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172 + ... + 1162.

It is an arithmetic number, because the mean of its divisors is an integer number (89280).

2⁶⁶⁰⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

660997 is a deficient number, since it is larger than the sum of its proper divisors (53243).

660997 is a wasteful number, since it uses less digits than its factorization.

660997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 660997 is about 813.0172199898. The cubic root of 660997 is about 87.1096956020.

The spelling of 660997 in words is "six hundred sixty thousand, nine hundred ninety-seven".