129712057856 has 20 divisors (see below), whose sum is σ = 259170772872. Its totient is φ = 64856028672.

The previous prime is 129712057837. The next prime is 129712057859. The reversal of 129712057856 is 658750217921.

129712057856 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 129712057798 and 129712057807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129712057859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126671420 + ... + 126672443.

Almost surely, 2^129712057856 is an apocalyptic number.

129712057856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129712057856 is a deficient number, since it is larger than the sum of its proper divisors (129458715016).

129712057856 is an frugal number, since it uses more digits than its factorization.

129712057856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253343881 (or 253343865 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 53.

The spelling of 129712057856 in words is "one hundred twenty-nine billion, seven hundred twelve million, fifty-seven thousand, eight hundred fifty-six".