26256216517 has 4 divisors (see below), whose sum is σ = 26302361580. Its totient is φ = 26210071456.

The previous prime is 26256216499. The next prime is 26256216617. The reversal of 26256216517 is 71561265262.

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 8810825956 + 17445390561 = 93866^2 + 132081^2 .

It is a cyclic number.

It is not a de Polignac number, because 26256216517 - 2²⁷ = 26121998789 is a prime.

It is a super-2 number, since 2×26256216517² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26256216617) 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, 23071678 + ... + 23072815.

It is an arithmetic number, because the mean of its divisors is an integer number (6575590395).

Almost surely, 2^26256216517 is an apocalyptic number.

It is an amenable number.

26256216517 is a deficient number, since it is larger than the sum of its proper divisors (46145063).

26256216517 is an equidigital number, since it uses as much as digits as its factorization.

26256216517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46145062.

The product of its digits is 302400, while the sum is 43.

The spelling of 26256216517 in words is "twenty-six billion, two hundred fifty-six million, two hundred sixteen thousand, five hundred seventeen".