6659907456840 has 128 divisors (see below), whose sum is σ = 22327672187520. Its totient is φ = 1575144396800.

The previous prime is 6659907456749. The next prime is 6659907456841. The reversal of 6659907456840 is 486547099566.

It is not an unprimeable number, because it can be changed into a prime (6659907456841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61474959 + ... + 61583198.

It is an arithmetic number, because the mean of its divisors is an integer number (174434938965).

Almost surely, 2^{6659907456840} is an apocalyptic number.

6659907456840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6659907456840 is an abundant number, since it is smaller than the sum of its proper divisors (15667764730680).

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

6659907456840 is a wasteful number, since it uses less digits than its factorization.

6659907456840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123058223 (or 123058219 counting only the distinct ones).

The product of its (nonzero) digits is 391910400, while the sum is 69.

The spelling of 6659907456840 in words is "six trillion, six hundred fifty-nine billion, nine hundred seven million, four hundred fifty-six thousand, eight hundred forty".