6666426064 has 10 divisors (see below), whose sum is σ = 12916200530. Its totient is φ = 3333213024.

The previous prime is 6666426059. The next prime is 6666426071. The reversal of 6666426064 is 4606246666.

It can be written as a sum of positive squares in only one way, i.e., 4775915664 + 1890510400 = 69108^2 + 43480^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208325799 + ... + 208325830.

It is an arithmetic number, because the mean of its divisors is an integer number (1291620053).

Almost surely, 2^6666426064 is an apocalyptic number.

It is an amenable number.

6666426064 is a deficient number, since it is larger than the sum of its proper divisors (6249774466).

6666426064 is a wasteful number, since it uses less digits than its factorization.

6666426064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416651637 (or 416651631 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 46.

The square root of 6666426064 is about 81648.1846950684. The cubic root of 6666426064 is about 1882.0494159119.

The spelling of 6666426064 in words is "six billion, six hundred sixty-six million, four hundred twenty-six thousand, sixty-four".