20125533026161 has 2 divisors, whose sum is σ = 20125533026162. Its totient is φ = 20125533026160.

The previous prime is 20125533026101. The next prime is 20125533026189. The reversal of 20125533026161 is 16162033552102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14788208655936 + 5337324370225 = 3845544^2 + 2310265^2 .

It is a cyclic number.

It is not a de Polignac number, because 20125533026161 - 2⁷ = 20125533026033 is a prime.

It is a super-4 number, since 4×20125533026161⁴ (a number of 54 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20125533026161.

It is not a weakly prime, because it can be changed into another prime (20125533026101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062766513080 + 10062766513081.

It is an arithmetic number, because the mean of its divisors is an integer number (10062766513081).

Almost surely, 2^{20125533026161} is an apocalyptic number.

It is an amenable number.

20125533026161 is a deficient number, since it is larger than the sum of its proper divisors (1).

20125533026161 is an equidigital number, since it uses as much as digits as its factorization.

20125533026161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

Adding to 20125533026161 its reverse (16162033552102), we get a palindrome (36287566578263).

The spelling of 20125533026161 in words is "twenty trillion, one hundred twenty-five billion, five hundred thirty-three million, twenty-six thousand, one hundred sixty-one".