26220543857 has 2 divisors, whose sum is σ = 26220543858. Its totient is φ = 26220543856.

The previous prime is 26220543851. The next prime is 26220543887. The reversal of 26220543857 is 75834502262.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19042896016 + 7177647841 = 137996^2 + 84721^2 .

It is a cyclic number.

It is not a de Polignac number, because 26220543857 - 2²⁸ = 25952108401 is a prime.

It is not a weakly prime, because it can be changed into another prime (26220543851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13110271928 + 13110271929.

It is an arithmetic number, because the mean of its divisors is an integer number (13110271929).

Almost surely, 2^26220543857 is an apocalyptic number.

It is an amenable number.

26220543857 is a deficient number, since it is larger than the sum of its proper divisors (1).

26220543857 is an equidigital number, since it uses as much as digits as its factorization.

26220543857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 44.

The spelling of 26220543857 in words is "twenty-six billion, two hundred twenty million, five hundred forty-three thousand, eight hundred fifty-seven".