129661648896 has 120 divisors (see below), whose sum is σ = 372352129744. Its totient is φ = 39895695360.

The previous prime is 129661648891. The next prime is 129661648943. The reversal of 129661648896 is 698846166921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129661648891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 537516 + ... + 740436.

Almost surely, 2^129661648896 is an apocalyptic number.

129661648896 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 129661648896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186176064872).

129661648896 is an abundant number, since it is smaller than the sum of its proper divisors (242690480848).

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

129661648896 is an equidigital number, since it uses as much as digits as its factorization.

129661648896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202965 (or 202939 counting only the distinct ones).

The product of its digits is 53747712, while the sum is 66.

The spelling of 129661648896 in words is "one hundred twenty-nine billion, six hundred sixty-one million, six hundred forty-eight thousand, eight hundred ninety-six".