166851868689 has 24 divisors (see below), whose sum is σ = 263088072000. Its totient is φ = 101056969440.

The previous prime is 166851868657. The next prime is 166851868691. The reversal of 166851868689 is 986868158661.

It is not a de Polignac number, because 166851868689 - 2⁵ = 166851868657 is a prime.

It is a super-2 number, since 2×166851868689² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166851868639) 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 in 23 ways as a sum of consecutive naturals, for example, 390669 + ... + 697370.

It is an arithmetic number, because the mean of its divisors is an integer number (10962003000).

Almost surely, 2^166851868689 is an apocalyptic number.

It is an amenable number.

166851868689 is a deficient number, since it is larger than the sum of its proper divisors (96236203311).

166851868689 is a wasteful number, since it uses less digits than its factorization.

166851868689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089605 (or 1089602 counting only the distinct ones).

The product of its digits is 238878720, while the sum is 72.

The spelling of 166851868689 in words is "one hundred sixty-six billion, eight hundred fifty-one million, eight hundred sixty-eight thousand, six hundred eighty-nine".