26069727781 has 2 divisors, whose sum is σ = 26069727782. Its totient is φ = 26069727780.

The previous prime is 26069727757. The next prime is 26069727793. The reversal of 26069727781 is 18772796062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18757767681 + 7311960100 = 136959^2 + 85510^2 .

It is a cyclic number.

It is not a de Polignac number, because 26069727781 - 2¹⁹ = 26069203493 is a prime.

It is a super-2 number, since 2×26069727781² (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 (26069727581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13034863890 + 13034863891.

It is an arithmetic number, because the mean of its divisors is an integer number (13034863891).

Almost surely, 2^26069727781 is an apocalyptic number.

It is an amenable number.

26069727781 is a deficient number, since it is larger than the sum of its proper divisors (1).

26069727781 is an equidigital number, since it uses as much as digits as its factorization.

26069727781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3556224, while the sum is 55.

The spelling of 26069727781 in words is "twenty-six billion, sixty-nine million, seven hundred twenty-seven thousand, seven hundred eighty-one".