26001251639981 has 2 divisors, whose sum is σ = 26001251639982. Its totient is φ = 26001251639980.

The previous prime is 26001251639939. The next prime is 26001251640019. The reversal of 26001251639981 is 18993615210062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18655747792900 + 7345503847081 = 4319230^2 + 2710259^2 .

It is a cyclic number.

It is not a de Polignac number, because 26001251639981 - 2⁶ = 26001251639917 is a prime.

It is a super-2 number, since 2×26001251639981² (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 (26001251639081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13000625819990 + 13000625819991.

It is an arithmetic number, because the mean of its divisors is an integer number (13000625819991).

Almost surely, 2^{26001251639981} is an apocalyptic number.

It is an amenable number.

26001251639981 is a deficient number, since it is larger than the sum of its proper divisors (1).

26001251639981 is an equidigital number, since it uses as much as digits as its factorization.

26001251639981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1399680, while the sum is 53.

The spelling of 26001251639981 in words is "twenty-six trillion, one billion, two hundred fifty-one million, six hundred thirty-nine thousand, nine hundred eighty-one".