129880195650 has 108 divisors (see below), whose sum is σ = 357665305686. Its totient is φ = 33789772800.

The previous prime is 129880195607. The next prime is 129880195703. The reversal of 129880195650 is 56591088921.

It can be written as a sum of positive squares in 9 ways, for example, as 31166724681 + 98713470969 = 176541^2 + 314187^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 670602 + ... + 842298.

Almost surely, 2^129880195650 is an apocalyptic number.

129880195650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129880195650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178832652843).

129880195650 is an abundant number, since it is smaller than the sum of its proper divisors (227785110036).

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

129880195650 is a wasteful number, since it uses less digits than its factorization.

129880195650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171797 (or 171748 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 54.

The spelling of 129880195650 in words is "one hundred twenty-nine billion, eight hundred eighty million, one hundred ninety-five thousand, six hundred fifty".