26815435261 has 2 divisors, whose sum is σ = 26815435262. Its totient is φ = 26815435260.

The previous prime is 26815435253. The next prime is 26815435267. The reversal of 26815435261 is 16253451862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25798463161 + 1016972100 = 160619^2 + 31890^2 .

It is a cyclic number.

It is not a de Polignac number, because 26815435261 - 2³ = 26815435253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26815435267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13407717630 + 13407717631.

It is an arithmetic number, because the mean of its divisors is an integer number (13407717631).

Almost surely, 2^26815435261 is an apocalyptic number.

It is an amenable number.

26815435261 is a deficient number, since it is larger than the sum of its proper divisors (1).

26815435261 is an equidigital number, since it uses as much as digits as its factorization.

26815435261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 43.

The spelling of 26815435261 in words is "twenty-six billion, eight hundred fifteen million, four hundred thirty-five thousand, two hundred sixty-one".