129044465550 has 960 divisors, whose sum is σ = 486993830400. Its totient is φ = 24466406400.

The previous prime is 129044465531. The next prime is 129044465593. The reversal of 129044465550 is 55564440921.

129044465550 is a `hidden beast` number, since 1 + 2 + 90 + 4 + 4 + 4 + 6 + 5 + 550 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 129044465496 and 129044465505.

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 479 ways as a sum of consecutive naturals, for example, 563512836 + ... + 563513064.

It is an arithmetic number, because the mean of its divisors is an integer number (507285240).

Almost surely, 2^129044465550 is an apocalyptic number.

129044465550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129044465550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243496915200).

129044465550 is an abundant number, since it is smaller than the sum of its proper divisors (357949364850).

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

129044465550 is a wasteful number, since it uses less digits than its factorization.

129044465550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 129044465550 in words is "one hundred twenty-nine billion, forty-four million, four hundred sixty-five thousand, five hundred fifty".