129855832061 has 2 divisors, whose sum is σ = 129855832062. Its totient is φ = 129855832060.

The previous prime is 129855832013. The next prime is 129855832121. The reversal of 129855832061 is 160238558921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109690128025 + 20165704036 = 331195^2 + 142006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129855832061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129855832361) by changing a digit.

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 as a sum of consecutive naturals, namely, 64927916030 + 64927916031.

It is an arithmetic number, because the mean of its divisors is an integer number (64927916031).

Almost surely, 2^129855832061 is an apocalyptic number.

It is an amenable number.

129855832061 is a deficient number, since it is larger than the sum of its proper divisors (1).

129855832061 is an equidigital number, since it uses as much as digits as its factorization.

129855832061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 129855832061 in words is "one hundred twenty-nine billion, eight hundred fifty-five million, eight hundred thirty-two thousand, sixty-one".