166611868004178 has 24 divisors (see below), whose sum is σ = 360992845365516. Its totient is φ = 55537217844000.

The previous prime is 166611868004129. The next prime is 166611868004213. The reversal of 166611868004178 is 871400868116661.

It can be written as a sum of positive squares in 2 ways, for example, as 150704669049489 + 15907198954689 = 12276183^2 + 3988383^2 .

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 11 ways as a sum of consecutive naturals, for example, 9497728 + ... + 20577428.

Almost surely, 2^{166611868004178} is an apocalyptic number.

166611868004178 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

166611868004178 is an abundant number, since it is smaller than the sum of its proper divisors (194380977361338).

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

166611868004178 is a wasteful number, since it uses less digits than its factorization.

166611868004178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11915130 (or 11915127 counting only the distinct ones).

The product of its (nonzero) digits is 18579456, while the sum is 63.

The spelling of 166611868004178 in words is "one hundred sixty-six trillion, six hundred eleven billion, eight hundred sixty-eight million, four thousand, one hundred seventy-eight".