166685336850 has 48 divisors (see below), whose sum is σ = 426714474240. Its totient is φ = 43015569600.

The previous prime is 166685336849. The next prime is 166685336887. The reversal of 166685336850 is 58633586661.

166685336850 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

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, 17918505 + ... + 17927804.

It is an arithmetic number, because the mean of its divisors is an integer number (8889884880).

Almost surely, 2^166685336850 is an apocalyptic number.

166685336850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166685336850 is an abundant number, since it is smaller than the sum of its proper divisors (260029137390).

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

166685336850 is a wasteful number, since it uses less digits than its factorization.

166685336850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35846355 (or 35846350 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 57.

The spelling of 166685336850 in words is "one hundred sixty-six billion, six hundred eighty-five million, three hundred thirty-six thousand, eight hundred fifty".