6656144643 has 12 divisors (see below), whose sum is σ = 9630123360. Its totient is φ = 4430187216.

The previous prime is 6656144629. The next prime is 6656144669. The reversal of 6656144643 is 3464416566.

6656144643 is a `hidden beast` number, since 6 + 6 + 561 + 4 + 46 + 43 = 666.

It is not a de Polignac number, because 6656144643 - 2⁵ = 6656144611 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6656144603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 597723 + ... + 608756.

It is an arithmetic number, because the mean of its divisors is an integer number (802510280).

Almost surely, 2^6656144643 is an apocalyptic number.

6656144643 is a deficient number, since it is larger than the sum of its proper divisors (2973978717).

6656144643 is a wasteful number, since it uses less digits than its factorization.

6656144643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207098 (or 1207095 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The square root of 6656144643 is about 81585.1986759853. The cubic root of 6656144643 is about 1881.0813760436.

The spelling of 6656144643 in words is "six billion, six hundred fifty-six million, one hundred forty-four thousand, six hundred forty-three".