129509969904 has 80 divisors (see below), whose sum is σ = 424847530240. Its totient is φ = 37002847680.

The previous prime is 129509969887. The next prime is 129509969929. The reversal of 129509969904 is 409969905921.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 21410662 + ... + 21416709.

It is an arithmetic number, because the mean of its divisors is an integer number (5310594128).

Almost surely, 2^129509969904 is an apocalyptic number.

129509969904 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

129509969904 is an abundant number, since it is smaller than the sum of its proper divisors (295337560336).

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

129509969904 is a wasteful number, since it uses less digits than its factorization.

129509969904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42827395 (or 42827383 counting only the distinct ones).

The product of its (nonzero) digits is 14171760, while the sum is 63.

The spelling of 129509969904 in words is "one hundred twenty-nine billion, five hundred nine million, nine hundred sixty-nine thousand, nine hundred four".