20111010110161 has 2 divisors, whose sum is σ = 20111010110162. Its totient is φ = 20111010110160.

The previous prime is 20111010110153. The next prime is 20111010110167. The reversal of 20111010110161 is 16101101011102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18816023009536 + 1294987100625 = 4337744^2 + 1137975^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111010110161 - 2³ = 20111010110153 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111010110167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055505055080 + 10055505055081.

It is an arithmetic number, because the mean of its divisors is an integer number (10055505055081).

Almost surely, 2^{20111010110161} is an apocalyptic number.

It is an amenable number.

20111010110161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111010110161 is an equidigital number, since it uses as much as digits as its factorization.

20111010110161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 16.

Adding to 20111010110161 its reverse (16101101011102), we get a palindrome (36212111121263).

The spelling of 20111010110161 in words is "twenty trillion, one hundred eleven billion, ten million, one hundred ten thousand, one hundred sixty-one".