129553355856 has 40 divisors (see below), whose sum is σ = 336378407904. Its totient is φ = 42965238400.

The previous prime is 129553355849. The next prime is 129553355861. The reversal of 129553355856 is 658553355921.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 129553355796 and 129553355805.

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 7 ways as a sum of consecutive naturals, for example, 6840870 + ... + 6859781.

Almost surely, 2^129553355856 is an apocalyptic number.

129553355856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129553355856 is an abundant number, since it is smaller than the sum of its proper divisors (206825052048).

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

129553355856 is a wasteful number, since it uses less digits than its factorization.

129553355856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13700859 (or 13700853 counting only the distinct ones).

The product of its digits is 24300000, while the sum is 57.

The spelling of 129553355856 in words is "one hundred twenty-nine billion, five hundred fifty-three million, three hundred fifty-five thousand, eight hundred fifty-six".