6721228644480 has 1536 divisors, whose sum is σ = 28274626195200. Its totient is φ = 1504192757760.

The previous prime is 6721228644469. The next prime is 6721228644617. The reversal of 6721228644480 is 844468221276.

It is a happy number.

6721228644480 is a `hidden beast` number, since 6 + 7 + 21 + 22 + 86 + 44 + 480 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 14579671450 + ... + 14579671910.

Almost surely, 2^{6721228644480} is an apocalyptic number.

6721228644480 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 6721228644480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14137313097600).

6721228644480 is an abundant number, since it is smaller than the sum of its proper divisors (21553397550720).

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

6721228644480 is a wasteful number, since it uses less digits than its factorization.

6721228644480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 8257536, while the sum is 54.

The spelling of 6721228644480 in words is "six trillion, seven hundred twenty-one billion, two hundred twenty-eight million, six hundred forty-four thousand, four hundred eighty".