6666636454400 has 240 divisors, whose sum is σ = 17820421649184. Its totient is φ = 2456993710080.

The previous prime is 6666636454393. The next prime is 6666636454477. The reversal of 6666636454400 is 44546366666.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 90984179 + ... + 91057421.

Almost surely, 2^{6666636454400} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6666636454400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8910210824592).

6666636454400 is an abundant number, since it is smaller than the sum of its proper divisors (11153785194784).

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

6666636454400 is a wasteful number, since it uses less digits than its factorization.

6666636454400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73831 (or 73810 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 56.

The spelling of 6666636454400 in words is "six trillion, six hundred sixty-six billion, six hundred thirty-six million, four hundred fifty-four thousand, four hundred".