521470111682161 has 2 divisors, whose sum is σ = 521470111682162. Its totient is φ = 521470111682160.

The previous prime is 521470111682017. The next prime is 521470111682207. The reversal of 521470111682161 is 161286111074125.

It is an a-pointer prime, because the next prime (521470111682207) can be obtained adding 521470111682161 to its sum of digits (46).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 411098698273761 + 110371413408400 = 20275569^2 + 10505780^2 .

It is a cyclic number.

It is not a de Polignac number, because 521470111682161 - 2¹⁹ = 521470111157873 is a prime.

It is not a weakly prime, because it can be changed into another prime (521470111682461) 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, 260735055841080 + 260735055841081.

It is an arithmetic number, because the mean of its divisors is an integer number (260735055841081).

Almost surely, 2^{521470111682161} is an apocalyptic number.

It is an amenable number.

521470111682161 is a deficient number, since it is larger than the sum of its proper divisors (1).

521470111682161 is an equidigital number, since it uses as much as digits as its factorization.

521470111682161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 46.

The spelling of 521470111682161 in words is "five hundred twenty-one trillion, four hundred seventy billion, one hundred eleven million, six hundred eighty-two thousand, one hundred sixty-one".