6331745640 has 128 divisors (see below), whose sum is σ = 20759587200. Its totient is φ = 1532190720.

The previous prime is 6331745639. The next prime is 6331745663. The reversal of 6331745640 is 465471336.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 778716 + ... + 786804.

It is an arithmetic number, because the mean of its divisors is an integer number (162184275).

Almost surely, 2^6331745640 is an apocalyptic number.

6331745640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6331745640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10379793600).

6331745640 is an abundant number, since it is smaller than the sum of its proper divisors (14427841560).

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

6331745640 is a wasteful number, since it uses less digits than its factorization.

6331745640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8707 (or 8703 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 39.

The square root of 6331745640 is about 79572.2667768111. The cubic root of 6331745640 is about 1850.0117496210.

The spelling of 6331745640 in words is "six billion, three hundred thirty-one million, seven hundred forty-five thousand, six hundred forty".