20126271663557 has 2 divisors, whose sum is σ = 20126271663558. Its totient is φ = 20126271663556.

The previous prime is 20126271663481. The next prime is 20126271663587. The reversal of 20126271663557 is 75536617262102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19868289952996 + 257981710561 = 4457386^2 + 507919^2 .

It is a cyclic number.

It is not a de Polignac number, because 20126271663557 - 2⁸ = 20126271663301 is a prime.

It is a super-2 number, since 2×20126271663557² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20126271663499 and 20126271663508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20126271663587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10063135831778 + 10063135831779.

It is an arithmetic number, because the mean of its divisors is an integer number (10063135831779).

Almost surely, 2^{20126271663557} is an apocalyptic number.

It is an amenable number.

20126271663557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20126271663557 is an equidigital number, since it uses as much as digits as its factorization.

20126271663557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6350400, while the sum is 53.

The spelling of 20126271663557 in words is "twenty trillion, one hundred twenty-six billion, two hundred seventy-one million, six hundred sixty-three thousand, five hundred fifty-seven".