6663856356 has 36 divisors (see below), whose sum is σ = 16854992700. Its totient is φ = 2219934528.

The previous prime is 6663856343. The next prime is 6663856361. The reversal of 6663856356 is 6536583666.

It can be written as a sum of positive squares in 2 ways, for example, as 4325166756 + 2338689600 = 65766^2 + 48360^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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, 4630 + ... + 115538.

Almost surely, 2^6663856356 is an apocalyptic number.

It is an amenable number.

6663856356 is an abundant number, since it is smaller than the sum of its proper divisors (10191136344).

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

6663856356 is a wasteful number, since it uses less digits than its factorization.

6663856356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112588 (or 112583 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 54.

The square root of 6663856356 is about 81632.4467108514. The cubic root of 6663856356 is about 1881.8075602336.

The spelling of 6663856356 in words is "six billion, six hundred sixty-three million, eight hundred fifty-six thousand, three hundred fifty-six".