6667021384 has 8 divisors (see below), whose sum is σ = 12500665110. Its totient is φ = 3333510688.

The previous prime is 6667021373. The next prime is 6667021399. The reversal of 6667021384 is 4831207666.

It can be written as a sum of positive squares in only one way, i.e., 3396325284 + 3270696100 = 58278^2 + 57190^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 6667021384.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416688829 + ... + 416688844.

Almost surely, 2^6667021384 is an apocalyptic number.

It is an amenable number.

6667021384 is a deficient number, since it is larger than the sum of its proper divisors (5833643726).

6667021384 is a wasteful number, since it uses less digits than its factorization.

6667021384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833377679 (or 833377675 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 6667021384 is about 81651.8302550531. The cubic root of 6667021384 is about 1882.1054373491.

The spelling of 6667021384 in words is "six billion, six hundred sixty-seven million, twenty-one thousand, three hundred eighty-four".