26860191081 has 4 divisors (see below), whose sum is σ = 35813588112. Its totient is φ = 17906794052.

The previous prime is 26860191067. The next prime is 26860191157. The reversal of 26860191081 is 18019106862.

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 26860191081 - 2⁵ = 26860191049 is a prime.

It is a super-2 number, since 2×26860191081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26860191031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4476698511 + ... + 4476698516.

It is an arithmetic number, because the mean of its divisors is an integer number (8953397028).

Almost surely, 2^26860191081 is an apocalyptic number.

It is an amenable number.

26860191081 is a deficient number, since it is larger than the sum of its proper divisors (8953397031).

26860191081 is an equidigital number, since it uses as much as digits as its factorization.

26860191081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8953397030.

The product of its (nonzero) digits is 41472, while the sum is 42.

The spelling of 26860191081 in words is "twenty-six billion, eight hundred sixty million, one hundred ninety-one thousand, eighty-one".