166556697576 has 128 divisors (see below), whose sum is σ = 433116979200. Its totient is φ = 53317635840.

The previous prime is 166556697551. The next prime is 166556697611. The reversal of 166556697576 is 675796655661.

166556697576 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×166556697576² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166556697576.

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 31 ways as a sum of consecutive naturals, for example, 86163906 + ... + 86165838.

It is an arithmetic number, because the mean of its divisors is an integer number (3383726400).

Almost surely, 2^166556697576 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 166556697576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216558489600).

166556697576 is an abundant number, since it is smaller than the sum of its proper divisors (266560281624).

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

166556697576 is a wasteful number, since it uses less digits than its factorization.

166556697576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799 (or 2795 counting only the distinct ones).

The product of its digits is 428652000, while the sum is 69.

The spelling of 166556697576 in words is "one hundred sixty-six billion, five hundred fifty-six million, six hundred ninety-seven thousand, five hundred seventy-six".