6643055853 has 96 divisors (see below), whose sum is σ = 11564467200. Its totient is φ = 3596237568.

The previous prime is 6643055851. The next prime is 6643055879. The reversal of 6643055853 is 3585503466.

6643055853 is a `hidden beast` number, since 6 + 6 + 43 + 0 + 558 + 53 = 666.

It is not a de Polignac number, because 6643055853 - 2¹ = 6643055851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6643055799 and 6643055808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643055851) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14224726 + ... + 14225192.

It is an arithmetic number, because the mean of its divisors is an integer number (120463200).

Almost surely, 2^6643055853 is an apocalyptic number.

6643055853 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

6643055853 is a deficient number, since it is larger than the sum of its proper divisors (4921411347).

6643055853 is a wasteful number, since it uses less digits than its factorization.

6643055853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 45.

The square root of 6643055853 is about 81504.9437334939. The cubic root of 6643055853 is about 1879.8475669565.

The spelling of 6643055853 in words is "six billion, six hundred forty-three million, fifty-five thousand, eight hundred fifty-three".