6631807644 has 144 divisors (see below), whose sum is σ = 22129825536. Its totient is φ = 1621209600.

The previous prime is 6631807639. The next prime is 6631807657. The reversal of 6631807644 is 4467081366.

It is a happy number.

6631807644 is a `hidden beast` number, since 6 + 631 + 8 + 0 + 7 + 6 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 6631807644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23242 + ... + 117489.

It is an arithmetic number, because the mean of its divisors is an integer number (153679344).

Almost surely, 2^6631807644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6631807644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11064912768).

6631807644 is an abundant number, since it is smaller than the sum of its proper divisors (15498017892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6631807644 is a wasteful number, since it uses less digits than its factorization.

6631807644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140776 (or 140771 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 6631807644 is about 81435.9112676957. The cubic root of 6631807644 is about 1878.7859639624.

The spelling of 6631807644 in words is "six billion, six hundred thirty-one million, eight hundred seven thousand, six hundred forty-four".