66201856896 has 192 divisors, whose sum is σ = 207365147280. Its totient is φ = 18655322112.

The previous prime is 66201856891. The next prime is 66201856907. The reversal of 66201856896 is 69865810266.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66201856891) 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 23 ways as a sum of consecutive naturals, for example, 1349470 + ... + 1397666.

Almost surely, 2^66201856896 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 66201856896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103682573640).

66201856896 is an abundant number, since it is smaller than the sum of its proper divisors (141163290384).

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

66201856896 is a wasteful number, since it uses less digits than its factorization.

66201856896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48301 (or 48282 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 57.

The spelling of 66201856896 in words is "sixty-six billion, two hundred one million, eight hundred fifty-six thousand, eight hundred ninety-six".