166933880138 has 4 divisors (see below), whose sum is σ = 250400820210. Its totient is φ = 83466940068.

The previous prime is 166933880117. The next prime is 166933880143. The reversal of 166933880138 is 831088339661.

166933880138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831088339661 = 29 ⋅28658218609.

It can be written as a sum of positive squares in only one way, i.e., 159818451529 + 7115428609 = 399773^2 + 84353^2 .

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 as a sum of consecutive naturals, namely, 41733470033 + ... + 41733470036.

Almost surely, 2^166933880138 is an apocalyptic number.

166933880138 is a deficient number, since it is larger than the sum of its proper divisors (83466940072).

166933880138 is an equidigital number, since it uses as much as digits as its factorization.

166933880138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83466940071.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The spelling of 166933880138 in words is "one hundred sixty-six billion, nine hundred thirty-three million, eight hundred eighty thousand, one hundred thirty-eight".