6643013013 has 64 divisors (see below), whose sum is σ = 12205670400. Its totient is φ = 3477090240.

The previous prime is 6643013011. The next prime is 6643013021. The reversal of 6643013013 is 3103103466.

6643013013 is a `hidden beast` number, since 6 + 643 + 0 + 1 + 3 + 0 + 13 = 666.

It is not a de Polignac number, because 6643013013 - 2¹ = 6643013011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

6643013013 is a modest number, since divided by 13013 gives 6643 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643013011) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 311548 + ... + 332186.

It is an arithmetic number, because the mean of its divisors is an integer number (190713600).

Almost surely, 2^6643013013 is an apocalyptic number.

6643013013 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

6643013013 is a deficient number, since it is larger than the sum of its proper divisors (5562657387).

6643013013 is a wasteful number, since it uses less digits than its factorization.

6643013013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20799 (or 20793 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 6643013013 is about 81504.6809269259. The cubic root of 6643013013 is about 1879.8435260029.

Adding to 6643013013 its reverse (3103103466), we get a palindrome (9746116479).

The spelling of 6643013013 in words is "six billion, six hundred forty-three million, thirteen thousand, thirteen".