6663400680 has 32 divisors (see below), whose sum is σ = 19990202400. Its totient is φ = 1776906816.

The previous prime is 6663400669. The next prime is 6663400687. The reversal of 6663400680 is 860043666.

It is not an unprimeable number, because it can be changed into a prime (6663400687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27764050 + ... + 27764289.

It is an arithmetic number, because the mean of its divisors is an integer number (624693825).

Almost surely, 2^6663400680 is an apocalyptic number.

6663400680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6663400680 is an abundant number, since it is smaller than the sum of its proper divisors (13326801720).

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

6663400680 is a wasteful number, since it uses less digits than its factorization.

6663400680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55528353 (or 55528349 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 6663400680 is about 81629.6556405820. The cubic root of 6663400680 is about 1881.7646664475.

The spelling of 6663400680 in words is "six billion, six hundred sixty-three million, four hundred thousand, six hundred eighty".