166871605844 has 6 divisors (see below), whose sum is σ = 292025310234. Its totient is φ = 83435802920.

The previous prime is 166871605841. The next prime is 166871605883. The reversal of 166871605844 is 448506178661.

It can be written as a sum of positive squares in only one way, i.e., 166188306244 + 683299600 = 407662^2 + 26140^2 .

It is a super-2 number, since 2×166871605844² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166871605844.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166871605841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20858950727 + ... + 20858950734.

It is an arithmetic number, because the mean of its divisors is an integer number (48670885039).

Almost surely, 2^166871605844 is an apocalyptic number.

It is an amenable number.

166871605844 is a deficient number, since it is larger than the sum of its proper divisors (125153704390).

166871605844 is a wasteful number, since it uses less digits than its factorization.

166871605844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41717901465 (or 41717901463 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 56.

The spelling of 166871605844 in words is "one hundred sixty-six billion, eight hundred seventy-one million, six hundred five thousand, eight hundred forty-four".