166851836872 has 96 divisors (see below), whose sum is σ = 369550944000. Its totient is φ = 70595519904.

The previous prime is 166851836867. The next prime is 166851836887. The reversal of 166851836872 is 278638158661.

It is a self number, because there is not a number n which added to its sum of digits gives 166851836872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17120433 + ... + 17130175.

It is an arithmetic number, because the mean of its divisors is an integer number (3849489000).

Almost surely, 2^166851836872 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 166851836872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184775472000).

166851836872 is an abundant number, since it is smaller than the sum of its proper divisors (202699107128).

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

166851836872 is an frugal number, since it uses more digits than its factorization.

166851836872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9928 (or 9831 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 61.

The spelling of 166851836872 in words is "one hundred sixty-six billion, eight hundred fifty-one million, eight hundred thirty-six thousand, eight hundred seventy-two".