660998 has 8 divisors (see below), whose sum is σ = 1067808. Its totient is φ = 305064.

The previous prime is 660983. The next prime is 661009. The reversal of 660998 is 899066.

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

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660998.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12686 + ... + 12737.

It is an arithmetic number, because the mean of its divisors is an integer number (133476).

2⁶⁶⁰⁹⁹⁸ is an apocalyptic number.

660998 is a deficient number, since it is larger than the sum of its proper divisors (406810).

660998 is a wasteful number, since it uses less digits than its factorization.

660998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25438.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 660998 is about 813.0178349827. The cubic root of 660998 is about 87.1097395304.

The spelling of 660998 in words is "six hundred sixty thousand, nine hundred ninety-eight".