129188666880 has 2560 divisors, whose sum is σ = 633559449600. Its totient is φ = 24174526464.

The previous prime is 129188666869. The next prime is 129188666897. The reversal of 129188666880 is 88666881921.

It is a tau number, because it is divible by the number of its divisors (2560).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 2748695017 + ... + 2748695063.

It is an arithmetic number, because the mean of its divisors is an integer number (247484160).

Almost surely, 2^129188666880 is an apocalyptic number.

129188666880 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 129188666880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316779724800).

129188666880 is an abundant number, since it is smaller than the sum of its proper divisors (504370782720).

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

129188666880 is a wasteful number, since it uses less digits than its factorization.

129188666880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 63.

The spelling of 129188666880 in words is "one hundred twenty-nine billion, one hundred eighty-eight million, six hundred sixty-six thousand, eight hundred eighty".