1668605568 has 128 divisors (see below), whose sum is σ = 5100195840. Its totient is φ = 473472000.

The previous prime is 1668605551. The next prime is 1668605569. The reversal of 1668605568 is 8655068661.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 1668605568.

It is not an unprimeable number, because it can be changed into a prime (1668605569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 403833 + ... + 407943.

It is an arithmetic number, because the mean of its divisors is an integer number (39845280).

Almost surely, 2^1668605568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1668605568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2550097920).

1668605568 is an abundant number, since it is smaller than the sum of its proper divisors (3431590272).

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

1668605568 is a wasteful number, since it uses less digits than its factorization.

1668605568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4286 (or 4274 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 51.

The square root of 1668605568 is about 40848.5687386963. The cubic root of 1668605568 is about 1186.0906876690.

The spelling of 1668605568 in words is "one billion, six hundred sixty-eight million, six hundred five thousand, five hundred sixty-eight".