129810685556 has 12 divisors (see below), whose sum is σ = 227171852292. Its totient is φ = 64904442048.

The previous prime is 129810685553. The next prime is 129810685561. The reversal of 129810685556 is 655586018921.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11841792400 + 117968893156 = 108820^2 + 343466^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129810685553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180146 + ... + 540438.

It is an arithmetic number, because the mean of its divisors is an integer number (18930987691).

Almost surely, 2^129810685556 is an apocalyptic number.

It is a pronic number, being equal to 360292×360293.

It is an amenable number.

129810685556 is a deficient number, since it is larger than the sum of its proper divisors (97361166736).

129810685556 is a wasteful number, since it uses less digits than its factorization.

129810685556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450370 (or 450368 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 56.

The spelling of 129810685556 in words is "one hundred twenty-nine billion, eight hundred ten million, six hundred eighty-five thousand, five hundred fifty-six".