129968306516 has 12 divisors (see below), whose sum is σ = 229696463220. Its totient is φ = 64340745600.

The previous prime is 129968306509. The next prime is 129968306543. The reversal of 129968306516 is 615603869921.

It can be written as a sum of positive squares in 2 ways, for example, as 67195008400 + 62773298116 = 259220^2 + 250546^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160851461 + ... + 160852268.

It is an arithmetic number, because the mean of its divisors is an integer number (19141371935).

Almost surely, 2^129968306516 is an apocalyptic number.

It is an amenable number.

129968306516 is a deficient number, since it is larger than the sum of its proper divisors (99728156704).

129968306516 is a wasteful number, since it uses less digits than its factorization.

129968306516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321703834 (or 321703832 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 56.

The spelling of 129968306516 in words is "one hundred twenty-nine billion, nine hundred sixty-eight million, three hundred six thousand, five hundred sixteen".