129617834616666 has 128 divisors (see below), whose sum is σ = 332246463897600. Its totient is φ = 37043996042880.

The previous prime is 129617834616649. The next prime is 129617834616689. The reversal of 129617834616666 is 666616438716921.

It is a junction number, because it is equal to n+sod(n) for n = 129617834616594 and 129617834616603.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23233971 + ... + 28267526.

It is an arithmetic number, because the mean of its divisors is an integer number (2595675499200).

Almost surely, 2^{129617834616666} is an apocalyptic number.

129617834616666 is an abundant number, since it is smaller than the sum of its proper divisors (202628629280934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129617834616666 is a wasteful number, since it uses less digits than its factorization.

129617834616666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51501761 (or 51501755 counting only the distinct ones).

The product of its digits is 564350976, while the sum is 72.

The spelling of 129617834616666 in words is "one hundred twenty-nine trillion, six hundred seventeen billion, eight hundred thirty-four million, six hundred sixteen thousand, six hundred sixty-six".