20288664438517 has 2 divisors, whose sum is σ = 20288664438518. Its totient is φ = 20288664438516.

The previous prime is 20288664438433. The next prime is 20288664438533. The reversal of 20288664438517 is 71583446688202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20288664438436 + 81 = 4504294^2 + 9^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20288664438517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20288664439517) 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, 10144332219258 + 10144332219259.

It is an arithmetic number, because the mean of its divisors is an integer number (10144332219259).

Almost surely, 2^{20288664438517} is an apocalyptic number.

It is an amenable number.

20288664438517 is a deficient number, since it is larger than the sum of its proper divisors (1).

20288664438517 is an equidigital number, since it uses as much as digits as its factorization.

20288664438517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 123863040, while the sum is 64.

The spelling of 20288664438517 in words is "twenty trillion, two hundred eighty-eight billion, six hundred sixty-four million, four hundred thirty-eight thousand, five hundred seventeen".