26349025981 has 2 divisors, whose sum is σ = 26349025982. Its totient is φ = 26349025980.

The previous prime is 26349025873. The next prime is 26349025991. The reversal of 26349025981 is 18952094362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25685190756 + 663835225 = 160266^2 + 25765^2 .

It is a cyclic number.

It is not a de Polignac number, because 26349025981 - 2²⁹ = 25812155069 is a prime.

It is a super-2 number, since 2×26349025981² (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 (26349025991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13174512990 + 13174512991.

It is an arithmetic number, because the mean of its divisors is an integer number (13174512991).

Almost surely, 2^26349025981 is an apocalyptic number.

It is an amenable number.

26349025981 is a deficient number, since it is larger than the sum of its proper divisors (1).

26349025981 is an equidigital number, since it uses as much as digits as its factorization.

26349025981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 26349025981 in words is "twenty-six billion, three hundred forty-nine million, twenty-five thousand, nine hundred eighty-one".