6653963840 has 28 divisors (see below), whose sum is σ = 15844752156. Its totient is φ = 2661585408.

The previous prime is 6653963839. The next prime is 6653963879. The reversal of 6653963840 is 483693566.

It can be written as a sum of positive squares in 2 ways, for example, as 1711311424 + 4942652416 = 41368^2 + 70304^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10396499 + ... + 10397138.

Almost surely, 2^6653963840 is an apocalyptic number.

It is an amenable number.

6653963840 is an abundant number, since it is smaller than the sum of its proper divisors (9190788316).

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

6653963840 is a wasteful number, since it uses less digits than its factorization.

6653963840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20793654 (or 20793644 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 50.

The square root of 6653963840 is about 81571.8323932962. The cubic root of 6653963840 is about 1880.8759159648.

The spelling of 6653963840 in words is "six billion, six hundred fifty-three million, nine hundred sixty-three thousand, eight hundred forty".