561248425418221 has 2 divisors, whose sum is σ = 561248425418222. Its totient is φ = 561248425418220.

The previous prime is 561248425418179. The next prime is 561248425418363. The reversal of 561248425418221 is 122814524842165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 460700677395721 + 100547748022500 = 21463939^2 + 10027350^2 .

It is a cyclic number.

It is not a de Polignac number, because 561248425418221 - 2²⁹ = 561247888547309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561248425410221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280624212709110 + 280624212709111.

It is an arithmetic number, because the mean of its divisors is an integer number (280624212709111).

Almost surely, 2^{561248425418221} is an apocalyptic number.

It is an amenable number.

561248425418221 is a deficient number, since it is larger than the sum of its proper divisors (1).

561248425418221 is an equidigital number, since it uses as much as digits as its factorization.

561248425418221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9830400, while the sum is 55.

The spelling of 561248425418221 in words is "five hundred sixty-one trillion, two hundred forty-eight billion, four hundred twenty-five million, four hundred eighteen thousand, two hundred twenty-one".