66101165550 has 288 divisors, whose sum is σ = 209553087744. Its totient is φ = 14624064000.

The previous prime is 66101165531. The next prime is 66101165561. The reversal of 66101165550 is 5556110166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 16916697 + ... + 16920603.

It is an arithmetic number, because the mean of its divisors is an integer number (727614888).

Almost surely, 2^66101165550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66101165550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104776543872).

66101165550 is an abundant number, since it is smaller than the sum of its proper divisors (143451922194).

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

66101165550 is a wasteful number, since it uses less digits than its factorization.

66101165550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4104 (or 4096 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 66101165550 in words is "sixty-six billion, one hundred one million, one hundred sixty-five thousand, five hundred fifty".