129629616666 has 96 divisors (see below), whose sum is σ = 289587432960. Its totient is φ = 38646838560.

The previous prime is 129629616659. The next prime is 129629616667. The reversal of 129629616666 is 666616926921.

It is not an unprimeable number, because it can be changed into a prime (129629616667) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 63574075 + ... + 63576113.

It is an arithmetic number, because the mean of its divisors is an integer number (3016535760).

Almost surely, 2^129629616666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129629616666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144793716480).

129629616666 is an abundant number, since it is smaller than the sum of its proper divisors (159957816294).

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

129629616666 is a wasteful number, since it uses less digits than its factorization.

129629616666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440 (or 3429 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 60.

The spelling of 129629616666 in words is "one hundred twenty-nine billion, six hundred twenty-nine million, six hundred sixteen thousand, six hundred sixty-six".