20261172547163 has 2 divisors, whose sum is σ = 20261172547164. Its totient is φ = 20261172547162.

The previous prime is 20261172547159. The next prime is 20261172547171. The reversal of 20261172547163 is 36174527116202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20261172547163 - 2² = 20261172547159 is a prime.

It is a super-2 number, since 2×20261172547163² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20261172543163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130586273581 + 10130586273582.

It is an arithmetic number, because the mean of its divisors is an integer number (10130586273582).

Almost surely, 2^{20261172547163} is an apocalyptic number.

20261172547163 is a deficient number, since it is larger than the sum of its proper divisors (1).

20261172547163 is an equidigital number, since it uses as much as digits as its factorization.

20261172547163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 20261172547163 in words is "twenty trillion, two hundred sixty-one billion, one hundred seventy-two million, five hundred forty-seven thousand, one hundred sixty-three".