1668256704 has 84 divisors (see below), whose sum is σ = 4818476520. Its totient is φ = 551815680.

The previous prime is 1668256649. The next prime is 1668256717. The reversal of 1668256704 is 4076528661.

1668256704 is a `hidden beast` number, since 1 + 6 + 6 + 82 + 567 + 0 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1668256704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64402 + ... + 86510.

Almost surely, 2^1668256704 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 1668256704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2409238260).

1668256704 is an abundant number, since it is smaller than the sum of its proper divisors (3150219816).

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

1668256704 is a wasteful number, since it uses less digits than its factorization.

1668256704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22258 (or 22245 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 1668256704 is about 40844.2983046594. The cubic root of 1668256704 is about 1186.0080212018.

The spelling of 1668256704 in words is "one billion, six hundred sixty-eight million, two hundred fifty-six thousand, seven hundred four".