129199999952 has 40 divisors (see below), whose sum is σ = 252053529000. Its totient is φ = 64154368512.

The previous prime is 129199999933. The next prime is 129199999961. The reversal of 129199999952 is 259999991921.

It can be written as a sum of positive squares in 4 ways, for example, as 37836474256 + 91363525696 = 194516^2 + 302264^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129199999952.

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, 5084174 + ... + 5109522.

It is an arithmetic number, because the mean of its divisors is an integer number (6301338225).

Almost surely, 2^129199999952 is an apocalyptic number.

It is an amenable number.

129199999952 is a deficient number, since it is larger than the sum of its proper divisors (122853529048).

129199999952 is a wasteful number, since it uses less digits than its factorization.

129199999952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27543 (or 27537 counting only the distinct ones).

The product of its digits is 95659380, while the sum is 74.

The spelling of 129199999952 in words is "one hundred twenty-nine billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-two".