129165338820 has 48 divisors (see below), whose sum is σ = 413329085568. Its totient is φ = 29523505920.

The previous prime is 129165338803. The next prime is 129165338821. The reversal of 129165338820 is 28833561921.

It is a self number, because there is not a number n which added to its sum of digits gives 129165338820.

It is not an unprimeable number, because it can be changed into a prime (129165338821) 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 in 15 ways as a sum of consecutive naturals, for example, 153767841 + ... + 153768680.

It is an arithmetic number, because the mean of its divisors is an integer number (8611022616).

Almost surely, 2^129165338820 is an apocalyptic number.

129165338820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129165338820 is an abundant number, since it is smaller than the sum of its proper divisors (284163746748).

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

129165338820 is a wasteful number, since it uses less digits than its factorization.

129165338820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307536540 (or 307536538 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 129165338820 in words is "one hundred twenty-nine billion, one hundred sixty-five million, three hundred thirty-eight thousand, eight hundred twenty".