20126256127477 has 2 divisors, whose sum is σ = 20126256127478. Its totient is φ = 20126256127476.

The previous prime is 20126256127457. The next prime is 20126256127487. The reversal of 20126256127477 is 77472165262102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16537349424996 + 3588906702481 = 4066614^2 + 1894441^2 .

It is a cyclic number.

It is not a de Polignac number, because 20126256127477 - 2¹¹ = 20126256125429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20126256127457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10063128063738 + 10063128063739.

It is an arithmetic number, because the mean of its divisors is an integer number (10063128063739).

Almost surely, 2^{20126256127477} is an apocalyptic number.

It is an amenable number.

20126256127477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20126256127477 is an equidigital number, since it uses as much as digits as its factorization.

20126256127477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3951360, while the sum is 52.

The spelling of 20126256127477 in words is "twenty trillion, one hundred twenty-six billion, two hundred fifty-six million, one hundred twenty-seven thousand, four hundred seventy-seven".