26091166681 has 4 divisors (see below), whose sum is σ = 27464386000. Its totient is φ = 24717947364.

The previous prime is 26091166669. The next prime is 26091166711. The reversal of 26091166681 is 18666119062.

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 26091166681 - 2⁹ = 26091166169 is a prime.

It is a super-2 number, since 2×26091166681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26091166601) 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 in 3 ways as a sum of consecutive naturals, for example, 686609631 + ... + 686609668.

It is an arithmetic number, because the mean of its divisors is an integer number (6866096500).

Almost surely, 2^26091166681 is an apocalyptic number.

It is an amenable number.

26091166681 is a deficient number, since it is larger than the sum of its proper divisors (1373219319).

26091166681 is a wasteful number, since it uses less digits than its factorization.

26091166681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373219318.

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 26091166681 in words is "twenty-six billion, ninety-one million, one hundred sixty-six thousand, six hundred eighty-one".