6646687200 has 576 divisors, whose sum is σ = 26593297920. Its totient is φ = 1593630720.

The previous prime is 6646687193. The next prime is 6646687207. The reversal of 6646687200 is 27866466.

It is an interprime number because it is at equal distance from previous prime (6646687193) and next prime (6646687207).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646687207) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8445207 + ... + 8445993.

It is an arithmetic number, because the mean of its divisors is an integer number (46168920).

Almost surely, 2^6646687200 is an apocalyptic number.

6646687200 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 6646687200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13296648960).

6646687200 is an abundant number, since it is smaller than the sum of its proper divisors (19946610720).

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

6646687200 is a wasteful number, since it uses less digits than its factorization.

6646687200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856 (or 837 counting only the distinct ones).

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

The square root of 6646687200 is about 81527.2175411378. The cubic root of 6646687200 is about 1880.1900366220.

The spelling of 6646687200 in words is "six billion, six hundred forty-six million, six hundred eighty-seven thousand, two hundred".