129776172974181 has 48 divisors (see below), whose sum is σ = 198912666333888. Its totient is φ = 81251222976000.

The previous prime is 129776172974101. The next prime is 129776172974213. The reversal of 129776172974181 is 181479271677921.

129776172974181 is a `hidden beast` number, since 1 + 2 + 97 + 76 + 1 + 7 + 297 + 4 + 181 = 666.

It is not a de Polignac number, because 129776172974181 - 2¹⁴ = 129776172957797 is a prime.

It is a super-2 number, since 2×129776172974181² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129776172974101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 566838831 + ... + 567067731.

It is an arithmetic number, because the mean of its divisors is an integer number (4144013881956).

Almost surely, 2^{129776172974181} is an apocalyptic number.

It is an amenable number.

129776172974181 is a deficient number, since it is larger than the sum of its proper divisors (69136493359707).

129776172974181 is a wasteful number, since it uses less digits than its factorization.

129776172974181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236962 (or 236959 counting only the distinct ones).

The product of its digits is 149361408, while the sum is 72.

The spelling of 129776172974181 in words is "one hundred twenty-nine trillion, seven hundred seventy-six billion, one hundred seventy-two million, nine hundred seventy-four thousand, one hundred eighty-one".