129726061056 has 480 divisors, whose sum is σ = 429635448000. Its totient is φ = 38533791744.

The previous prime is 129726061027. The next prime is 129726061117. The reversal of 129726061056 is 650160627921.

129726061056 is a `hidden beast` number, since 1 + 2 + 9 + 7 + 26 + 0 + 610 + 5 + 6 = 666.

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, 75906730 + ... + 75908438.

It is an arithmetic number, because the mean of its divisors is an integer number (895073850).

Almost surely, 2^129726061056 is an apocalyptic number.

129726061056 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 129726061056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214817724000).

129726061056 is an abundant number, since it is smaller than the sum of its proper divisors (299909386944).

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

129726061056 is a wasteful number, since it uses less digits than its factorization.

129726061056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789 (or 1750 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

Adding to 129726061056 its reverse (650160627921), we get a palindrome (779886688977).

The spelling of 129726061056 in words is "one hundred twenty-nine billion, seven hundred twenty-six million, sixty-one thousand, fifty-six".