25311203875981 has 2 divisors, whose sum is σ = 25311203875982. Its totient is φ = 25311203875980.

The previous prime is 25311203875939. The next prime is 25311203876027. The reversal of 25311203875981 is 18957830211352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23334744666025 + 1976459209956 = 4830605^2 + 1405866^2 .

It is a cyclic number.

It is not a de Polignac number, because 25311203875981 - 2⁹ = 25311203875469 is a prime.

It is a super-2 number, since 2×25311203875981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25311203875901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12655601937990 + 12655601937991.

It is an arithmetic number, because the mean of its divisors is an integer number (12655601937991).

Almost surely, 2^{25311203875981} is an apocalyptic number.

It is an amenable number.

25311203875981 is a deficient number, since it is larger than the sum of its proper divisors (1).

25311203875981 is an equidigital number, since it uses as much as digits as its factorization.

25311203875981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 55.

The spelling of 25311203875981 in words is "twenty-five trillion, three hundred eleven billion, two hundred three million, eight hundred seventy-five thousand, nine hundred eighty-one".