129981099600 has 480 divisors, whose sum is σ = 507398774400. Its totient is φ = 31341772800.

The previous prime is 129981099571. The next prime is 129981099631. The reversal of 129981099600 is 6990189921.

129981099600 is a `hidden beast` number, since 1 + 29 + 9 + 8 + 1 + 0 + 9 + 9 + 600 = 666.

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 95 ways as a sum of consecutive naturals, for example, 22925566 + ... + 22931234.

It is an arithmetic number, because the mean of its divisors is an integer number (1057080780).

Almost surely, 2^129981099600 is an apocalyptic number.

129981099600 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 129981099600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253699387200).

129981099600 is an abundant number, since it is smaller than the sum of its proper divisors (377417674800).

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

129981099600 is a wasteful number, since it uses less digits than its factorization.

129981099600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5900 (or 5883 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 54.

The spelling of 129981099600 in words is "one hundred twenty-nine billion, nine hundred eighty-one million, ninety-nine thousand, six hundred".