26508898649 has 4 divisors (see below), whose sum is σ = 26943470820. Its totient is φ = 26074326480.

The previous prime is 26508898631. The next prime is 26508898651. The reversal of 26508898649 is 94689880562.

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 8196043024 + 18312855625 = 90532^2 + 135325^2 .

It is a cyclic number.

It is not a de Polignac number, because 26508898649 - 2²⁰ = 26507850073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26508892649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217285994 + ... + 217286115.

It is an arithmetic number, because the mean of its divisors is an integer number (6735867705).

Almost surely, 2^26508898649 is an apocalyptic number.

It is an amenable number.

26508898649 is a deficient number, since it is larger than the sum of its proper divisors (434572171).

26508898649 is an equidigital number, since it uses as much as digits as its factorization.

26508898649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434572170.

The product of its (nonzero) digits is 59719680, while the sum is 65.

The spelling of 26508898649 in words is "twenty-six billion, five hundred eight million, eight hundred ninety-eight thousand, six hundred forty-nine".