660203923 has 8 divisors (see below), whose sum is σ = 671938560. Its totient is φ = 648487560.

The previous prime is 660203917. The next prime is 660203981. The reversal of 660203923 is 329302066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660203923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660203723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82986 + ... + 90592.

It is an arithmetic number, because the mean of its divisors is an integer number (83992320).

Almost surely, 2^660203923 is an apocalyptic number.

660203923 is a deficient number, since it is larger than the sum of its proper divisors (11734637).

660203923 is a wasteful number, since it uses less digits than its factorization.

660203923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9137.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 660203923 is about 25694.4336968146. The cubic root of 660203923 is about 870.7484302615.

Adding to 660203923 its reverse (329302066), we get a palindrome (989505989).

The spelling of 660203923 in words is "six hundred sixty million, two hundred three thousand, nine hundred twenty-three".