1668871568 has 80 divisors (see below), whose sum is σ = 3989328000. Its totient is φ = 658603008.

The previous prime is 1668871541. The next prime is 1668871571. The reversal of 1668871568 is 8651788661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 725396 + ... + 727692.

It is an arithmetic number, because the mean of its divisors is an integer number (49866600).

Almost surely, 2^1668871568 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 1668871568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1994664000).

1668871568 is an abundant number, since it is smaller than the sum of its proper divisors (2320456432).

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

1668871568 is a wasteful number, since it uses less digits than its factorization.

1668871568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824 (or 2818 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 56.

The square root of 1668871568 is about 40851.8245369775. The cubic root of 1668871568 is about 1186.1537110232.

The spelling of 1668871568 in words is "one billion, six hundred sixty-eight million, eight hundred seventy-one thousand, five hundred sixty-eight".