129137538560 has 160 divisors (see below), whose sum is σ = 317192198400. Its totient is φ = 50405990400.

The previous prime is 129137538511. The next prime is 129137538571. The reversal of 129137538560 is 65835731921.

It is a tau number, because it is divible by the number of its divisors (160).

It is a junction number, because it is equal to n+sod(n) for n = 129137538499 and 129137538508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20991485 + ... + 20997635.

It is an arithmetic number, because the mean of its divisors is an integer number (1982451240).

Almost surely, 2^129137538560 is an apocalyptic number.

129137538560 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 129137538560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158596099200).

129137538560 is an abundant number, since it is smaller than the sum of its proper divisors (188054659840).

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

129137538560 is an equidigital number, since it uses as much as digits as its factorization.

129137538560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6372 (or 6356 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 50.

The spelling of 129137538560 in words is "one hundred twenty-nine billion, one hundred thirty-seven million, five hundred thirty-eight thousand, five hundred sixty".