66165506000 has 160 divisors (see below), whose sum is σ = 175314672000. Its totient is φ = 23952384000.

The previous prime is 66165505999. The next prime is 66165506041. The reversal of 66165506000 is 60556166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4987376 + ... + 5000624.

It is an arithmetic number, because the mean of its divisors is an integer number (1095716700).

Almost surely, 2^66165506000 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 66165506000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87657336000).

66165506000 is an abundant number, since it is smaller than the sum of its proper divisors (109149166000).

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

66165506000 is a wasteful number, since it uses less digits than its factorization.

66165506000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13510 (or 13494 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 66165506000 in words is "sixty-six billion, one hundred sixty-five million, five hundred six thousand".