26781217411013 has 12 divisors (see below), whose sum is σ = 29000521034820. Its totient is φ = 24720491892096.

The previous prime is 26781217411001. The next prime is 26781217411021. The reversal of 26781217411013 is 31011471218762.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 8287760049409 + 18493457361604 = 2878847^2 + 4300402^2 .

It is not a de Polignac number, because 26781217411013 - 2¹⁴ = 26781217394629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26781217411313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4671545 + ... + 8682497.

It is an arithmetic number, because the mean of its divisors is an integer number (2416710086235).

Almost surely, 2^{26781217411013} is an apocalyptic number.

It is an amenable number.

26781217411013 is a deficient number, since it is larger than the sum of its proper divisors (2219303623807).

26781217411013 is a wasteful number, since it uses less digits than its factorization.

26781217411013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4050488 (or 4050475 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 44.

Adding to 26781217411013 its reverse (31011471218762), we get a palindrome (57792688629775).

The spelling of 26781217411013 in words is "twenty-six trillion, seven hundred eighty-one billion, two hundred seventeen million, four hundred eleven thousand, thirteen".