162561011112221 has 2 divisors, whose sum is σ = 162561011112222. Its totient is φ = 162561011112220.

The previous prime is 162561011112169. The next prime is 162561011112329. The reversal of 162561011112221 is 122211110165261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116251761204121 + 46309249908100 = 10782011^2 + 6805090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-162561011112221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162561011112421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81280505556110 + 81280505556111.

It is an arithmetic number, because the mean of its divisors is an integer number (81280505556111).

Almost surely, 2^{162561011112221} is an apocalyptic number.

It is an amenable number.

162561011112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

162561011112221 is an equidigital number, since it uses as much as digits as its factorization.

162561011112221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 32.

Adding to 162561011112221 its reverse (122211110165261), we get a palindrome (284772121277482).

The spelling of 162561011112221 in words is "one hundred sixty-two trillion, five hundred sixty-one billion, eleven million, one hundred twelve thousand, two hundred twenty-one".