26598779261 has 2 divisors, whose sum is σ = 26598779262. Its totient is φ = 26598779260.

The previous prime is 26598779167. The next prime is 26598779297. The reversal of 26598779261 is 16297789562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15019728025 + 11579051236 = 122555^2 + 107606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26598779261 is a prime.

It is a super-2 number, since 2×26598779261² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26598779194 and 26598779203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26598779761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13299389630 + 13299389631.

It is an arithmetic number, because the mean of its divisors is an integer number (13299389631).

Almost surely, 2^26598779261 is an apocalyptic number.

It is an amenable number.

26598779261 is a deficient number, since it is larger than the sum of its proper divisors (1).

26598779261 is an equidigital number, since it uses as much as digits as its factorization.

26598779261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22861440, while the sum is 62.

The spelling of 26598779261 in words is "twenty-six billion, five hundred ninety-eight million, seven hundred seventy-nine thousand, two hundred sixty-one".