26165613013261 has 2 divisors, whose sum is σ = 26165613013262. Its totient is φ = 26165613013260.

The previous prime is 26165613013249. The next prime is 26165613013357. The reversal of 26165613013261 is 16231031656162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14097847184100 + 12067765829161 = 3754710^2 + 3473869^2 .

It is a cyclic number.

It is not a de Polignac number, because 26165613013261 - 2⁴¹ = 23966589757709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26165613011261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13082806506630 + 13082806506631.

It is an arithmetic number, because the mean of its divisors is an integer number (13082806506631).

Almost surely, 2^{26165613013261} is an apocalyptic number.

It is an amenable number.

26165613013261 is a deficient number, since it is larger than the sum of its proper divisors (1).

26165613013261 is an equidigital number, since it uses as much as digits as its factorization.

26165613013261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 26165613013261 in words is "twenty-six trillion, one hundred sixty-five billion, six hundred thirteen million, thirteen thousand, two hundred sixty-one".