129289666320 has 960 divisors, whose sum is σ = 502071436800. Its totient is φ = 30891497472.

The previous prime is 129289666271. The next prime is 129289666349. The reversal of 129289666320 is 23666982921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 1452692836 + ... + 1452692924.

It is an arithmetic number, because the mean of its divisors is an integer number (522991080).

Almost surely, 2^129289666320 is an apocalyptic number.

129289666320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129289666320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251035718400).

129289666320 is an abundant number, since it is smaller than the sum of its proper divisors (372781770480).

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

129289666320 is an equidigital number, since it uses as much as digits as its factorization.

129289666320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 129289666320 in words is "one hundred twenty-nine billion, two hundred eighty-nine million, six hundred sixty-six thousand, three hundred twenty".