1668488923 has 4 divisors (see below), whose sum is σ = 1674426888. Its totient is φ = 1662550960.

The previous prime is 1668488917. The next prime is 1668488947. The reversal of 1668488923 is 3298848661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1668488923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668488023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2968561 + ... + 2969122.

It is an arithmetic number, because the mean of its divisors is an integer number (418606722).

Almost surely, 2^1668488923 is an apocalyptic number.

1668488923 is a deficient number, since it is larger than the sum of its proper divisors (5937965).

1668488923 is an equidigital number, since it uses as much as digits as its factorization.

1668488923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5937964.

The product of its digits is 3981312, while the sum is 55.

The square root of 1668488923 is about 40847.1409403400. The cubic root of 1668488923 is about 1186.0630488679.

The spelling of 1668488923 in words is "one billion, six hundred sixty-eight million, four hundred eighty-eight thousand, nine hundred twenty-three".