6662720880 has 320 divisors, whose sum is σ = 24941260800. Its totient is φ = 1628605440.

The previous prime is 6662720873. The next prime is 6662720917. The reversal of 6662720880 is 880272666.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1269622 + ... + 1274858.

It is an arithmetic number, because the mean of its divisors is an integer number (77941440).

Almost surely, 2^6662720880 is an apocalyptic number.

6662720880 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 6662720880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12470630400).

6662720880 is an abundant number, since it is smaller than the sum of its proper divisors (18278539920).

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

6662720880 is a wasteful number, since it uses less digits than its factorization.

6662720880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5309 (or 5297 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 6662720880 is about 81625.4916064828. The cubic root of 6662720880 is about 1881.7006717404.

The spelling of 6662720880 in words is "six billion, six hundred sixty-two million, seven hundred twenty thousand, eight hundred eighty".