6635638751 has 12 divisors (see below), whose sum is σ = 7721101440. Its totient is φ = 5686148160.

The previous prime is 6635638699. The next prime is 6635638829. The reversal of 6635638751 is 1578365366.

It is not a de Polignac number, because 6635638751 - 2⁶ = 6635638687 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6635638751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6635638351) 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, 187511 + ... + 220071.

It is an arithmetic number, because the mean of its divisors is an integer number (643425120).

Almost surely, 2^6635638751 is an apocalyptic number.

6635638751 is a deficient number, since it is larger than the sum of its proper divisors (1085462689).

6635638751 is a wasteful number, since it uses less digits than its factorization.

6635638751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36734 (or 36727 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 50.

The square root of 6635638751 is about 81459.4300925313. The cubic root of 6635638751 is about 1879.1476775333.

The spelling of 6635638751 in words is "six billion, six hundred thirty-five million, six hundred thirty-eight thousand, seven hundred fifty-one".