20455511541181 has 2 divisors, whose sum is σ = 20455511541182. Its totient is φ = 20455511541180.

The previous prime is 20455511541163. The next prime is 20455511541239. The reversal of 20455511541181 is 18114511555402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15341283072025 + 5114228469156 = 3916795^2 + 2261466^2 .

It is a cyclic number.

It is not a de Polignac number, because 20455511541181 - 2⁷ = 20455511541053 is a prime.

It is a super-2 number, since 2×20455511541181² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20455511541121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10227755770590 + 10227755770591.

It is an arithmetic number, because the mean of its divisors is an integer number (10227755770591).

Almost surely, 2^{20455511541181} is an apocalyptic number.

It is an amenable number.

20455511541181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20455511541181 is an equidigital number, since it uses as much as digits as its factorization.

20455511541181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160000, while the sum is 43.

The spelling of 20455511541181 in words is "twenty trillion, four hundred fifty-five billion, five hundred eleven million, five hundred forty-one thousand, one hundred eighty-one".