26081355665881 has 4 divisors (see below), whose sum is σ = 26089261506000. Its totient is φ = 26073449825764.

The previous prime is 26081355665863. The next prime is 26081355665927. The reversal of 26081355665881 is 18856655318062.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26081355665881 - 2¹⁷ = 26081355534809 is a prime.

It is a super-2 number, since 2×26081355665881² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26081355665081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3952915111 + ... + 3952921708.

It is an arithmetic number, because the mean of its divisors is an integer number (6522315376500).

Almost surely, 2^{26081355665881} is an apocalyptic number.

It is an amenable number.

26081355665881 is a deficient number, since it is larger than the sum of its proper divisors (7905840119).

26081355665881 is an equidigital number, since it uses as much as digits as its factorization.

26081355665881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7905840118.

The product of its (nonzero) digits is 82944000, while the sum is 64.

The spelling of 26081355665881 in words is "twenty-six trillion, eighty-one billion, three hundred fifty-five million, six hundred sixty-five thousand, eight hundred eighty-one".