6699966637056 has 352 divisors, whose sum is σ = 22807402813440. Its totient is φ = 1697803468800.

The previous prime is 6699966637051. The next prime is 6699966637087. The reversal of 6699966637056 is 6507366699966.

It is a tau number, because it is divible by the number of its divisors (352).

It is not an unprimeable number, because it can be changed into a prime (6699966637051) 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 31 ways as a sum of consecutive naturals, for example, 9352885 + ... + 10043723.

Almost surely, 2^{6699966637056} is an apocalyptic number.

6699966637056 is a gapful number since it is divisible by the number (66) 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 6699966637056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11403701406720).

6699966637056 is an abundant number, since it is smaller than the sum of its proper divisors (16107436176384).

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

6699966637056 is a wasteful number, since it uses less digits than its factorization.

6699966637056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690921 (or 690903 counting only the distinct ones).

The product of its (nonzero) digits is 3571283520, while the sum is 78.

The spelling of 6699966637056 in words is "six trillion, six hundred ninety-nine billion, nine hundred sixty-six million, six hundred thirty-seven thousand, fifty-six".