6640995600 has 360 divisors, whose sum is σ = 25311817440. Its totient is φ = 1666344960.

The previous prime is 6640995499. The next prime is 6640995601. The reversal of 6640995600 is 65990466.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (6640995601) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1650391 + ... + 1654409.

It is an arithmetic number, because the mean of its divisors is an integer number (70310604).

Almost surely, 2^6640995600 is an apocalyptic number.

6640995600 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 6640995600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12655908720).

6640995600 is an abundant number, since it is smaller than the sum of its proper divisors (18670821840).

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

6640995600 is a wasteful number, since it uses less digits than its factorization.

6640995600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069 (or 4046 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 6640995600 is about 81492.3039311075. The cubic root of 6640995600 is about 1879.6532105175.

The spelling of 6640995600 in words is "six billion, six hundred forty million, nine hundred ninety-five thousand, six hundred".