167661689869 has 12 divisors (see below), whose sum is σ = 173341656180. Its totient is φ = 162071245440.

The previous prime is 167661689857. The next prime is 167661689887. The reversal of 167661689869 is 968986166761.

It can be written as a sum of positive squares in 6 ways, for example, as 274332969 + 167387356900 = 16563^2 + 409130^2 .

It is not a de Polignac number, because 167661689869 - 2¹⁵ = 167661657101 is a prime.

It is a super-2 number, since 2×167661689869² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167661689369) 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 11 ways as a sum of consecutive naturals, for example, 315027 + ... + 659215.

It is an arithmetic number, because the mean of its divisors is an integer number (14445138015).

Almost surely, 2^167661689869 is an apocalyptic number.

It is an amenable number.

167661689869 is a deficient number, since it is larger than the sum of its proper divisors (5679966311).

167661689869 is an equidigital number, since it uses as much as digits as its factorization.

167661689869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344448 (or 344339 counting only the distinct ones).

The product of its digits is 282175488, while the sum is 73.

The spelling of 167661689869 in words is "one hundred sixty-seven billion, six hundred sixty-one million, six hundred eighty-nine thousand, eight hundred sixty-nine".