66939823552 has 168 divisors, whose sum is σ = 163524377040. Its totient is φ = 27033108480.

The previous prime is 66939823541. The next prime is 66939823583. The reversal of 66939823552 is 25532893966.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 11496802 + ... + 11502622.

Almost surely, 2^66939823552 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 66939823552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81762188520).

66939823552 is an abundant number, since it is smaller than the sum of its proper divisors (96584553488).

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

66939823552 is a wasteful number, since it uses less digits than its factorization.

66939823552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6059 (or 6042 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 58.

The spelling of 66939823552 in words is "sixty-six billion, nine hundred thirty-nine million, eight hundred twenty-three thousand, five hundred fifty-two".