6640225344 has 112 divisors (see below), whose sum is σ = 19559869440. Its totient is φ = 2209006080.

The previous prime is 6640225337. The next prime is 6640225351. The reversal of 6640225344 is 4435220466.

6640225344 is a `hidden beast` number, since 6 + 640 + 2 + 2 + 5 + 3 + 4 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (6640225337) and next prime (6640225351).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 6640225299 and 6640225308.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 931297 + ... + 938399.

Almost surely, 2^6640225344 is an apocalyptic number.

6640225344 is a gapful number since it is divisible by the number (64) 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 6640225344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9779934720).

6640225344 is an abundant number, since it is smaller than the sum of its proper divisors (12919644096).

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

6640225344 is a wasteful number, since it uses less digits than its factorization.

6640225344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7665 (or 7649 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The square root of 6640225344 is about 81487.5778508602. The cubic root of 6640225344 is about 1879.5805371700.

The spelling of 6640225344 in words is "six billion, six hundred forty million, two hundred twenty-five thousand, three hundred forty-four".