660303923 has 2 divisors, whose sum is σ = 660303924. Its totient is φ = 660303922.

The previous prime is 660303877. The next prime is 660303977. The reversal of 660303923 is 329303066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 660303923 - 2⁶ = 660303859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660303923.

It is not a weakly prime, because it can be changed into another prime (660308923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330151961 + 330151962.

It is an arithmetic number, because the mean of its divisors is an integer number (330151962).

Almost surely, 2^660303923 is an apocalyptic number.

660303923 is a deficient number, since it is larger than the sum of its proper divisors (1).

660303923 is an equidigital number, since it uses as much as digits as its factorization.

660303923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 32.

The square root of 660303923 is about 25696.3795698927. The cubic root of 660303923 is about 870.7923916518.

Adding to 660303923 its reverse (329303066), we get a palindrome (989606989).

The spelling of 660303923 in words is "six hundred sixty million, three hundred three thousand, nine hundred twenty-three".