166717183871054 has 4 divisors (see below), whose sum is σ = 250075775806584. Its totient is φ = 83358591935526.

The previous prime is 166717183871053. The next prime is 166717183871149. The reversal of 166717183871054 is 450178381717661.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166717183871053) by changing a digit.

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 as a sum of consecutive naturals, namely, 41679295967762 + ... + 41679295967765.

It is an arithmetic number, because the mean of its divisors is an integer number (62518943951646).

Almost surely, 2^{166717183871054} is an apocalyptic number.

166717183871054 is a deficient number, since it is larger than the sum of its proper divisors (83358591935530).

166717183871054 is an equidigital number, since it uses as much as digits as its factorization.

166717183871054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83358591935529.

The product of its (nonzero) digits is 47416320, while the sum is 65.

The spelling of 166717183871054 in words is "one hundred sixty-six trillion, seven hundred seventeen billion, one hundred eighty-three million, eight hundred seventy-one thousand, fifty-four".