26398525705 has 4 divisors (see below), whose sum is σ = 31678230852. Its totient is φ = 21118820560.

The previous prime is 26398525669. The next prime is 26398525733. The reversal of 26398525705 is 50752589362.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7247287161 + 19151238544 = 85131^2 + 138388^2 .

It is not a de Polignac number, because 26398525705 - 2¹⁹ = 26398001417 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2639852566 + ... + 2639852575.

It is an arithmetic number, because the mean of its divisors is an integer number (7919557713).

Almost surely, 2^26398525705 is an apocalyptic number.

It is an amenable number.

26398525705 is a deficient number, since it is larger than the sum of its proper divisors (5279705147).

26398525705 is an equidigital number, since it uses as much as digits as its factorization.

26398525705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5279705146.

The product of its (nonzero) digits is 4536000, while the sum is 52.

The spelling of 26398525705 in words is "twenty-six billion, three hundred ninety-eight million, five hundred twenty-five thousand, seven hundred five".