26310137981 has 2 divisors, whose sum is σ = 26310137982. Its totient is φ = 26310137980.

The previous prime is 26310137947. The next prime is 26310137993. The reversal of 26310137981 is 18973101362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24693293881 + 1616844100 = 157141^2 + 40210^2 .

It is a cyclic number.

It is not a de Polignac number, because 26310137981 - 2¹⁴ = 26310121597 is a prime.

It is a super-2 number, since 2×26310137981² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26310130981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13155068990 + 13155068991.

It is an arithmetic number, because the mean of its divisors is an integer number (13155068991).

Almost surely, 2^26310137981 is an apocalyptic number.

It is an amenable number.

26310137981 is a deficient number, since it is larger than the sum of its proper divisors (1).

26310137981 is an equidigital number, since it uses as much as digits as its factorization.

26310137981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 26310137981 in words is "twenty-six billion, three hundred ten million, one hundred thirty-seven thousand, nine hundred eighty-one".