20013171773461 has 2 divisors, whose sum is σ = 20013171773462. Its totient is φ = 20013171773460.

The previous prime is 20013171773389. The next prime is 20013171773501. The reversal of 20013171773461 is 16437717131002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19890395818225 + 122775955236 = 4459865^2 + 350394^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013171773461 - 2¹¹ = 20013171771413 is a prime.

It is a super-2 number, since 2×20013171773461² (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 (20013171773561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006585886730 + 10006585886731.

It is an arithmetic number, because the mean of its divisors is an integer number (10006585886731).

Almost surely, 2^{20013171773461} is an apocalyptic number.

It is an amenable number.

20013171773461 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013171773461 is an equidigital number, since it uses as much as digits as its factorization.

20013171773461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 148176, while the sum is 43.

The spelling of 20013171773461 in words is "twenty trillion, thirteen billion, one hundred seventy-one million, seven hundred seventy-three thousand, four hundred sixty-one".