20126261744569 has 2 divisors, whose sum is σ = 20126261744570. Its totient is φ = 20126261744568.

The previous prime is 20126261744473. The next prime is 20126261744587. The reversal of 20126261744569 is 96544716262102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19702616970169 + 423644774400 = 4438763^2 + 650880^2 .

It is a cyclic number.

It is not a de Polignac number, because 20126261744569 - 2²⁵ = 20126228190137 is a prime.

It is a super-2 number, since 2×20126261744569² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20126261714569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10063130872284 + 10063130872285.

It is an arithmetic number, because the mean of its divisors is an integer number (10063130872285).

Almost surely, 2^{20126261744569} is an apocalyptic number.

It is an amenable number.

20126261744569 is a deficient number, since it is larger than the sum of its proper divisors (1).

20126261744569 is an equidigital number, since it uses as much as digits as its factorization.

20126261744569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 20126261744569 in words is "twenty trillion, one hundred twenty-six billion, two hundred sixty-one million, seven hundred forty-four thousand, five hundred sixty-nine".