26513877517 has 2 divisors, whose sum is σ = 26513877518. Its totient is φ = 26513877516.

The previous prime is 26513877487. The next prime is 26513877553. The reversal of 26513877517 is 71577831562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22642424676 + 3871452841 = 150474^2 + 62221^2 .

It is a cyclic number.

It is not a de Polignac number, because 26513877517 - 2¹¹ = 26513875469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26513877317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13256938758 + 13256938759.

It is an arithmetic number, because the mean of its divisors is an integer number (13256938759).

Almost surely, 2^26513877517 is an apocalyptic number.

It is an amenable number.

26513877517 is a deficient number, since it is larger than the sum of its proper divisors (1).

26513877517 is an equidigital number, since it uses as much as digits as its factorization.

26513877517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2469600, while the sum is 52.

The spelling of 26513877517 in words is "twenty-six billion, five hundred thirteen million, eight hundred seventy-seven thousand, five hundred seventeen".