129979323648 has 288 divisors, whose sum is σ = 401722854400. Its totient is φ = 41923215360.

The previous prime is 129979323623. The next prime is 129979323701. The reversal of 129979323648 is 846323979921.

129979323648 is a `hidden beast` number, since 1 + 299 + 79 + 3 + 236 + 48 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17352288 + ... + 17359776.

Almost surely, 2^129979323648 is an apocalyptic number.

129979323648 is a gapful number since it is divisible by the number (18) 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 129979323648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200861427200).

129979323648 is an abundant number, since it is smaller than the sum of its proper divisors (271743530752).

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

129979323648 is an frugal number, since it uses more digits than its factorization.

129979323648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7557 (or 7525 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 63.

The spelling of 129979323648 in words is "one hundred twenty-nine billion, nine hundred seventy-nine million, three hundred twenty-three thousand, six hundred forty-eight".