129129329518 has 16 divisors (see below), whose sum is σ = 221556916224. Its totient is φ = 55293053400.

The previous prime is 129129329507. The next prime is 129129329599. The reversal of 129129329518 is 815923921921.

It is a happy number.

129129329518 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×129129329518² (a number of 23 digits) contains 22 as substring.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 3990630 + ... + 4022857.

It is an arithmetic number, because the mean of its divisors is an integer number (13847307264).

Almost surely, 2^129129329518 is an apocalyptic number.

129129329518 is a deficient number, since it is larger than the sum of its proper divisors (92427586706).

129129329518 is a wasteful number, since it uses less digits than its factorization.

129129329518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8014647.

The product of its digits is 699840, while the sum is 52.

The spelling of 129129329518 in words is "one hundred twenty-nine billion, one hundred twenty-nine million, three hundred twenty-nine thousand, five hundred eighteen".