26804392981 has 2 divisors, whose sum is σ = 26804392982. Its totient is φ = 26804392980.

The previous prime is 26804392969. The next prime is 26804392987. The reversal of 26804392981 is 18929340862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25808422500 + 995970481 = 160650^2 + 31559^2 .

It is a cyclic number.

It is not a de Polignac number, because 26804392981 - 2²⁷ = 26670175253 is a prime.

It is a super-2 number, since 2×26804392981² (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 (26804392987) 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, 13402196490 + 13402196491.

It is an arithmetic number, because the mean of its divisors is an integer number (13402196491).

Almost surely, 2^26804392981 is an apocalyptic number.

It is an amenable number.

26804392981 is a deficient number, since it is larger than the sum of its proper divisors (1).

26804392981 is an equidigital number, since it uses as much as digits as its factorization.

26804392981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 52.

The spelling of 26804392981 in words is "twenty-six billion, eight hundred four million, three hundred ninety-two thousand, nine hundred eighty-one".