129961268185 has 32 divisors (see below), whose sum is σ = 180876563712. Its totient is φ = 87797053440.

The previous prime is 129961268167. The next prime is 129961268209. The reversal of 129961268185 is 581862169921.

It is not a de Polignac number, because 129961268185 - 2⁵ = 129961268153 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2289345 + ... + 2345425.

It is an arithmetic number, because the mean of its divisors is an integer number (5652392616).

Almost surely, 2^129961268185 is an apocalyptic number.

It is an amenable number.

129961268185 is a deficient number, since it is larger than the sum of its proper divisors (50915295527).

129961268185 is an equidigital number, since it uses as much as digits as its factorization.

129961268185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57073.

The product of its digits is 3732480, while the sum is 58.

The spelling of 129961268185 in words is "one hundred twenty-nine billion, nine hundred sixty-one million, two hundred sixty-eight thousand, one hundred eighty-five".