129155068186 has 12 divisors (see below), whose sum is σ = 194539982526. Its totient is φ = 64309519680.

The previous prime is 129155068183. The next prime is 129155068219. The reversal of 129155068186 is 681860551921.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 98985115161 + 30169953025 = 314619^2 + 173695^2 .

It is not an unprimeable number, because it can be changed into a prime (129155068183) by changing a digit.

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 in 5 ways as a sum of consecutive naturals, for example, 439765 + ... + 672088.

Almost surely, 2^129155068186 is an apocalyptic number.

129155068186 is a deficient number, since it is larger than the sum of its proper divisors (65384914340).

129155068186 is an equidigital number, since it uses as much as digits as its factorization.

129155068186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112337 (or 1112096 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 52.

The spelling of 129155068186 in words is "one hundred twenty-nine billion, one hundred fifty-five million, sixty-eight thousand, one hundred eighty-six".