26128265081 has 2 divisors, whose sum is σ = 26128265082. Its totient is φ = 26128265080.

The previous prime is 26128265069. The next prime is 26128265087. The reversal of 26128265081 is 18056282162.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23010159481 + 3118105600 = 151691^2 + 55840^2 .

It is a cyclic number.

It is not a de Polignac number, because 26128265081 - 2³⁰ = 25054523257 is a prime.

It is a super-2 number, since 2×26128265081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26128265087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13064132540 + 13064132541.

It is an arithmetic number, because the mean of its divisors is an integer number (13064132541).

Almost surely, 2^26128265081 is an apocalyptic number.

It is an amenable number.

26128265081 is a deficient number, since it is larger than the sum of its proper divisors (1).

26128265081 is an equidigital number, since it uses as much as digits as its factorization.

26128265081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 41.

The spelling of 26128265081 in words is "twenty-six billion, one hundred twenty-eight million, two hundred sixty-five thousand, eighty-one".