26254621681 has 2 divisors, whose sum is σ = 26254621682. Its totient is φ = 26254621680.

The previous prime is 26254621651. The next prime is 26254621753. The reversal of 26254621681 is 18612645262.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20540622400 + 5713999281 = 143320^2 + 75591^2 .

It is a cyclic number.

It is not a de Polignac number, because 26254621681 - 2¹⁹ = 26254097393 is a prime.

It is a super-2 number, since 2×26254621681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26254621651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13127310840 + 13127310841.

It is an arithmetic number, because the mean of its divisors is an integer number (13127310841).

Almost surely, 2^26254621681 is an apocalyptic number.

It is an amenable number.

26254621681 is a deficient number, since it is larger than the sum of its proper divisors (1).

26254621681 is an equidigital number, since it uses as much as digits as its factorization.

26254621681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 43.

The spelling of 26254621681 in words is "twenty-six billion, two hundred fifty-four million, six hundred twenty-one thousand, six hundred eighty-one".