6646420480 has 176 divisors, whose sum is σ = 18570384000. Its totient is φ = 2235138048.

The previous prime is 6646420463. The next prime is 6646420481. The reversal of 6646420480 is 840246466.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646420481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1897771 + ... + 1901269.

Almost surely, 2^6646420480 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 6646420480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9285192000).

6646420480 is an abundant number, since it is smaller than the sum of its proper divisors (11923963520).

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

6646420480 is a wasteful number, since it uses less digits than its factorization.

6646420480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584 (or 3566 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The square root of 6646420480 is about 81525.5817519875. The cubic root of 6646420480 is about 1880.1648867000.

The spelling of 6646420480 in words is "six billion, six hundred forty-six million, four hundred twenty thousand, four hundred eighty".