26564655449 has 4 divisors (see below), whose sum is σ = 26565778740. Its totient is φ = 26563532160.

The previous prime is 26564655433. The next prime is 26564655473. The reversal of 26564655449 is 94455646562.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94455646562 = 2 ⋅47227823281.

It can be written as a sum of positive squares in 2 ways, for example, as 25397203225 + 1167452224 = 159365^2 + 34168^2 .

It is a cyclic number.

It is not a de Polignac number, because 26564655449 - 2⁴ = 26564655433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26564655394 and 26564655403.

It is not an unprimeable number, because it can be changed into a prime (26564655409) 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, 525392 + ... + 573729.

It is an arithmetic number, because the mean of its divisors is an integer number (6641444685).

Almost surely, 2^26564655449 is an apocalyptic number.

It is an amenable number.

26564655449 is a deficient number, since it is larger than the sum of its proper divisors (1123291).

26564655449 is a wasteful number, since it uses less digits than its factorization.

26564655449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123290.

The product of its digits is 31104000, while the sum is 56.

The spelling of 26564655449 in words is "twenty-six billion, five hundred sixty-four million, six hundred fifty-five thousand, four hundred forty-nine".