6639137653 has 16 divisors (see below), whose sum is σ = 7085491200. Its totient is φ = 6199168000.

The previous prime is 6639137647. The next prime is 6639137671. The reversal of 6639137653 is 3567319366.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6639137653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6639137597 and 6639137606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639137623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1299498 + ... + 1304596.

It is an arithmetic number, because the mean of its divisors is an integer number (442843200).

Almost surely, 2^6639137653 is an apocalyptic number.

It is an amenable number.

6639137653 is a deficient number, since it is larger than the sum of its proper divisors (446353547).

6639137653 is a wasteful number, since it uses less digits than its factorization.

6639137653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5708.

The product of its digits is 1837080, while the sum is 49.

The square root of 6639137653 is about 81480.9036093734. The cubic root of 6639137653 is about 1879.4779043845.

The spelling of 6639137653 in words is "six billion, six hundred thirty-nine million, one hundred thirty-seven thousand, six hundred fifty-three".