26497775789 has 2 divisors, whose sum is σ = 26497775790. Its totient is φ = 26497775788.

The previous prime is 26497775741. The next prime is 26497775819. The reversal of 26497775789 is 98757779462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25432275625 + 1065500164 = 159475^2 + 32642^2 .

It is a cyclic number.

It is not a de Polignac number, because 26497775789 - 2⁸ = 26497775533 is a prime.

It is a super-2 number, since 2×26497775789² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26497775989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13248887894 + 13248887895.

It is an arithmetic number, because the mean of its divisors is an integer number (13248887895).

Almost surely, 2^26497775789 is an apocalyptic number.

It is an amenable number.

26497775789 is a deficient number, since it is larger than the sum of its proper divisors (1).

26497775789 is an equidigital number, since it uses as much as digits as its factorization.

26497775789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373403520, while the sum is 71.

The spelling of 26497775789 in words is "twenty-six billion, four hundred ninety-seven million, seven hundred seventy-five thousand, seven hundred eighty-nine".