20126261744591 has 2 divisors, whose sum is σ = 20126261744592. Its totient is φ = 20126261744590.

The previous prime is 20126261744587. The next prime is 20126261744593. The reversal of 20126261744591 is 19544716262102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20126261744591 - 2² = 20126261744587 is a prime.

Together with 20126261744593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20126261744593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10063130872295 + 10063130872296.

It is an arithmetic number, because the mean of its divisors is an integer number (10063130872296).

Almost surely, 2^{20126261744591} is an apocalyptic number.

20126261744591 is a deficient number, since it is larger than the sum of its proper divisors (1).

20126261744591 is an equidigital number, since it uses as much as digits as its factorization.

20126261744591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 20126261744591 in words is "twenty trillion, one hundred twenty-six billion, two hundred sixty-one million, seven hundred forty-four thousand, five hundred ninety-one".