20011010161 has 2 divisors, whose sum is σ = 20011010162. Its totient is φ = 20011010160.

The previous prime is 20011010087. The next prime is 20011010177. The reversal of 20011010161 is 16101011002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14913050161 + 5097960000 = 122119^2 + 71400^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011010161 - 2²³ = 20002621553 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011011161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005505080 + 10005505081.

It is an arithmetic number, because the mean of its divisors is an integer number (10005505081).

Almost surely, 2^20011010161 is an apocalyptic number.

It is an amenable number.

20011010161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011010161 is an equidigital number, since it uses as much as digits as its factorization.

20011010161 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 13.

Adding to 20011010161 its reverse (16101011002), we get a palindrome (36112021163).

The spelling of 20011010161 in words is "twenty billion, eleven million, ten thousand, one hundred sixty-one".