12561700229989 has 2 divisors, whose sum is σ = 12561700229990. Its totient is φ = 12561700229988.

The previous prime is 12561700229983. The next prime is 12561700230017. The reversal of 12561700229989 is 98992200716521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9975901156225 + 2585799073764 = 3158465^2 + 1608042^2 .

It is a cyclic number.

It is not a de Polignac number, because 12561700229989 - 2¹¹ = 12561700227941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12561700229983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6280850114994 + 6280850114995.

It is an arithmetic number, because the mean of its divisors is an integer number (6280850114995).

Almost surely, 2^{12561700229989} is an apocalyptic number.

It is an amenable number.

12561700229989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12561700229989 is an equidigital number, since it uses as much as digits as its factorization.

12561700229989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9797760, while the sum is 61.

The spelling of 12561700229989 in words is "twelve trillion, five hundred sixty-one billion, seven hundred million, two hundred twenty-nine thousand, nine hundred eighty-nine".