129786320912 has 40 divisors (see below), whose sum is σ = 253384373880. Its totient is φ = 64398458880.

The previous prime is 129786320893. The next prime is 129786320947. The reversal of 129786320912 is 219023687921.

It can be written as a sum of positive squares in 4 ways, for example, as 71259099136 + 58527221776 = 266944^2 + 241924^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1211612 + ... + 1314372.

It is an arithmetic number, because the mean of its divisors is an integer number (6334609347).

Almost surely, 2^129786320912 is an apocalyptic number.

It is an amenable number.

129786320912 is a deficient number, since it is larger than the sum of its proper divisors (123598052968).

129786320912 is a wasteful number, since it uses less digits than its factorization.

129786320912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103371 (or 103365 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 129786320912 in words is "one hundred twenty-nine billion, seven hundred eighty-six million, three hundred twenty thousand, nine hundred twelve".