129896323456 has 64 divisors (see below), whose sum is σ = 260717508000. Its totient is φ = 64462970880.

The previous prime is 129896323439. The next prime is 129896323471. The reversal of 129896323456 is 654323698921.

It is a tau number, because it is divible by the number of its divisors (64).

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 129896323456.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10717656 + ... + 10729768.

Almost surely, 2^129896323456 is an apocalyptic number.

129896323456 is a gapful number since it is divisible by the number (16) 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 129896323456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130358754000).

129896323456 is an abundant number, since it is smaller than the sum of its proper divisors (130821184544).

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

129896323456 is a wasteful number, since it uses less digits than its factorization.

129896323456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12747 (or 12735 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 58.

The spelling of 129896323456 in words is "one hundred twenty-nine billion, eight hundred ninety-six million, three hundred twenty-three thousand, four hundred fifty-six".