129201660 has 216 divisors, whose sum is σ = 466615968. Its totient is φ = 28339200.

The previous prime is 129201659. The next prime is 129201671. The reversal of 129201660 is 66102921.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2118030 + ... + 2118090.

Almost surely, 2^129201660 is an apocalyptic number.

129201660 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 129201660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233307984).

129201660 is an abundant number, since it is smaller than the sum of its proper divisors (337414308).

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

129201660 is a wasteful number, since it uses less digits than its factorization.

129201660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 129201660 is about 11366.6908113136. The cubic root of 129201660 is about 505.5405902711.

The spelling of 129201660 in words is "one hundred twenty-nine million, two hundred one thousand, six hundred sixty".