129994937856 has 480 divisors, whose sum is σ = 460073053440. Its totient is φ = 35853705216.

The previous prime is 129994937819. The next prime is 129994937873. The reversal of 129994937856 is 658739499921.

129994937856 is a `hidden beast` number, since 12 + 9 + 9 + 9 + 493 + 78 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25253875 + ... + 25259021.

It is an arithmetic number, because the mean of its divisors is an integer number (958485528).

Almost surely, 2^129994937856 is an apocalyptic number.

129994937856 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 129994937856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230036526720).

129994937856 is an abundant number, since it is smaller than the sum of its proper divisors (330078115584).

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

129994937856 is an frugal number, since it uses more digits than its factorization.

129994937856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5216 (or 5188 counting only the distinct ones).

The product of its digits is 264539520, while the sum is 72.

The spelling of 129994937856 in words is "one hundred twenty-nine billion, nine hundred ninety-four million, nine hundred thirty-seven thousand, eight hundred fifty-six".