26811556081 has 2 divisors, whose sum is σ = 26811556082. Its totient is φ = 26811556080.

The previous prime is 26811556073. The next prime is 26811556133. The reversal of 26811556081 is 18065511862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26653827600 + 157728481 = 163260^2 + 12559^2 .

It is a cyclic number.

It is not a de Polignac number, because 26811556081 - 2³ = 26811556073 is a prime.

It is a super-2 number, since 2×26811556081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26811556061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13405778040 + 13405778041.

It is an arithmetic number, because the mean of its divisors is an integer number (13405778041).

Almost surely, 2^26811556081 is an apocalyptic number.

It is an amenable number.

26811556081 is a deficient number, since it is larger than the sum of its proper divisors (1).

26811556081 is an equidigital number, since it uses as much as digits as its factorization.

26811556081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 115200, while the sum is 43.

The spelling of 26811556081 in words is "twenty-six billion, eight hundred eleven million, five hundred fifty-six thousand, eighty-one".