20254365235217 has 2 divisors, whose sum is σ = 20254365235218. Its totient is φ = 20254365235216.

The previous prime is 20254365235171. The next prime is 20254365235243. The reversal of 20254365235217 is 71253256345202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15476953973776 + 4777411261441 = 3934076^2 + 2185729^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20254365235217 is a prime.

It is a super-2 number, since 2×20254365235217² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20254365235277) 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, 10127182617608 + 10127182617609.

It is an arithmetic number, because the mean of its divisors is an integer number (10127182617609).

Almost surely, 2^{20254365235217} is an apocalyptic number.

It is an amenable number.

20254365235217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20254365235217 is an equidigital number, since it uses as much as digits as its factorization.

20254365235217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024000, while the sum is 47.

The spelling of 20254365235217 in words is "twenty trillion, two hundred fifty-four billion, three hundred sixty-five million, two hundred thirty-five thousand, two hundred seventeen".