26205465397 has 2 divisors, whose sum is σ = 26205465398. Its totient is φ = 26205465396.

The previous prime is 26205465301. The next prime is 26205465409. The reversal of 26205465397 is 79356450262.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22938314116 + 3267151281 = 151454^2 + 57159^2 .

It is a cyclic number.

It is not a de Polignac number, because 26205465397 - 2¹⁹ = 26204941109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26205465397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26205475397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13102732698 + 13102732699.

It is an arithmetic number, because the mean of its divisors is an integer number (13102732699).

Almost surely, 2^26205465397 is an apocalyptic number.

It is an amenable number.

26205465397 is a deficient number, since it is larger than the sum of its proper divisors (1).

26205465397 is an equidigital number, since it uses as much as digits as its factorization.

26205465397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2721600, while the sum is 49.

The spelling of 26205465397 in words is "twenty-six billion, two hundred five million, four hundred sixty-five thousand, three hundred ninety-seven".