129551038840 has 64 divisors (see below), whose sum is σ = 296814873600. Its totient is φ = 50882162688.

The previous prime is 129551038801. The next prime is 129551038871. The reversal of 129551038840 is 48830155921.

It is a super-3 number, since 3×129551038840³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361306 + ... + 624214.

It is an arithmetic number, because the mean of its divisors is an integer number (4637732400).

Almost surely, 2^129551038840 is an apocalyptic number.

129551038840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129551038840 is an abundant number, since it is smaller than the sum of its proper divisors (167263834760).

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

129551038840 is a wasteful number, since it uses less digits than its factorization.

129551038840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263144 (or 263140 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 46.

The spelling of 129551038840 in words is "one hundred twenty-nine billion, five hundred fifty-one million, thirty-eight thousand, eight hundred forty".