6663609892 has 12 divisors (see below), whose sum is σ = 11689019356. Its totient is φ = 3323890080.

The previous prime is 6663609889. The next prime is 6663609893. The reversal of 6663609892 is 2989063666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 829094436 + 5834515456 = 28794^2 + 76384^2 .

It is not an unprimeable number, because it can be changed into a prime (6663609893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1976823 + ... + 1980190.

Almost surely, 2^6663609892 is an apocalyptic number.

It is an amenable number.

6663609892 is a deficient number, since it is larger than the sum of its proper divisors (5025409464).

6663609892 is a wasteful number, since it uses less digits than its factorization.

6663609892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957438 (or 3957436 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 55.

The square root of 6663609892 is about 81630.9371010771. The cubic root of 6663609892 is about 1881.7843602769.

The spelling of 6663609892 in words is "six billion, six hundred sixty-three million, six hundred nine thousand, eight hundred ninety-two".