129553355861 has 2 divisors, whose sum is σ = 129553355862. Its totient is φ = 129553355860.

The previous prime is 129553355849. The next prime is 129553355881. The reversal of 129553355861 is 168553355921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69481796836 + 60071559025 = 263594^2 + 245095^2 .

It is a cyclic number.

It is not a de Polignac number, because 129553355861 - 2¹⁴ = 129553339477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129553355831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64776677930 + 64776677931.

It is an arithmetic number, because the mean of its divisors is an integer number (64776677931).

Almost surely, 2^129553355861 is an apocalyptic number.

It is an amenable number.

129553355861 is a deficient number, since it is larger than the sum of its proper divisors (1).

129553355861 is an equidigital number, since it uses as much as digits as its factorization.

129553355861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860000, while the sum is 53.

It can be divided in two parts, 129553355 and 861, that added together give a cube (129554216 = 506³).

The spelling of 129553355861 in words is "one hundred twenty-nine billion, five hundred fifty-three million, three hundred fifty-five thousand, eight hundred sixty-one".