12412155220561 has 2 divisors, whose sum is σ = 12412155220562. Its totient is φ = 12412155220560.

The previous prime is 12412155220529. The next prime is 12412155220627. The reversal of 12412155220561 is 16502255121421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6749183130561 + 5662972090000 = 2597919^2 + 2379700^2 .

It is a cyclic number.

It is not a de Polignac number, because 12412155220561 - 2⁵ = 12412155220529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12412155220561.

It is not a weakly prime, because it can be changed into another prime (12412155220511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6206077610280 + 6206077610281.

It is an arithmetic number, because the mean of its divisors is an integer number (6206077610281).

Almost surely, 2^{12412155220561} is an apocalyptic number.

It is an amenable number.

12412155220561 is a deficient number, since it is larger than the sum of its proper divisors (1).

12412155220561 is an equidigital number, since it uses as much as digits as its factorization.

12412155220561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48000, while the sum is 37.

The spelling of 12412155220561 in words is "twelve trillion, four hundred twelve billion, one hundred fifty-five million, two hundred twenty thousand, five hundred sixty-one".