1668344064 has 36 divisors (see below), whose sum is σ = 4440230256. Its totient is φ = 556114432.

The previous prime is 1668344063. The next prime is 1668344087. The reversal of 1668344064 is 4604438661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1668344063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085394 + ... + 1086929.

Almost surely, 2^1668344064 is an apocalyptic number.

It is an amenable number.

1668344064 is an abundant number, since it is smaller than the sum of its proper divisors (2771886192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1668344064 is an equidigital number, since it uses as much as digits as its factorization.

1668344064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2172342 (or 2172328 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 42.

The square root of 1668344064 is about 40845.3677177719. The cubic root of 1668344064 is about 1186.0287230222.

The spelling of 1668344064 in words is "one billion, six hundred sixty-eight million, three hundred forty-four thousand, sixty-four".