6666938975952 has 480 divisors, whose sum is σ = 19991455131648. Its totient is φ = 2149675573248.

The previous prime is 6666938975911. The next prime is 6666938975981. The reversal of 6666938975952 is 2595798396666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 11841809623 + ... + 11841810185.

Almost surely, 2^{6666938975952} 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 6666938975952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9995727565824).

6666938975952 is an abundant number, since it is smaller than the sum of its proper divisors (13324516155696).

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

6666938975952 is a wasteful number, since it uses less digits than its factorization.

6666938975952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189 (or 1171 counting only the distinct ones).

The product of its digits is 7936185600, while the sum is 81.

The spelling of 6666938975952 in words is "six trillion, six hundred sixty-six billion, nine hundred thirty-eight million, nine hundred seventy-five thousand, nine hundred fifty-two".