6668865408 has 128 divisors (see below), whose sum is σ = 18136742400. Its totient is φ = 2170572800.

The previous prime is 6668865389. The next prime is 6668865409. The reversal of 6668865408 is 8045688666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6668865409) 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, 2835433 + ... + 2837783.

It is an arithmetic number, because the mean of its divisors is an integer number (141693300).

Almost surely, 2^6668865408 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 6668865408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9068371200).

6668865408 is an abundant number, since it is smaller than the sum of its proper divisors (11467876992).

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

6668865408 is a wasteful number, since it uses less digits than its factorization.

6668865408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2540 (or 2528 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 57.

The square root of 6668865408 is about 81663.1214686287. The cubic root of 6668865408 is about 1882.2789445005.

The spelling of 6668865408 in words is "six billion, six hundred sixty-eight million, eight hundred sixty-five thousand, four hundred eight".