129471009906866 has 8 divisors (see below), whose sum is σ = 194209540594860. Its totient is φ = 64734496375248.

The previous prime is 129471009906857. The next prime is 129471009906919. The reversal of 129471009906866 is 668609900174921.

It can be written as a sum of positive squares in 2 ways, for example, as 128782891545025 + 688118361841 = 11348255^2 + 829529^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 129471009906796 and 129471009906805.

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, 504128621 + ... + 504385376.

Almost surely, 2^{129471009906866} is an apocalyptic number.

129471009906866 is a deficient number, since it is larger than the sum of its proper divisors (64738530687994).

129471009906866 is a wasteful number, since it uses less digits than its factorization.

129471009906866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1008578188.

The product of its (nonzero) digits is 70543872, while the sum is 68.

The spelling of 129471009906866 in words is "one hundred twenty-nine trillion, four hundred seventy-one billion, nine million, nine hundred six thousand, eight hundred sixty-six".