26122027891 has 6 divisors (see below), whose sum is σ = 26991857076. Its totient is φ = 25279380900.

The previous prime is 26122027873. The next prime is 26122027901. The reversal of 26122027891 is 19872022162.

It is not a de Polignac number, because 26122027891 - 2²⁵ = 26088473459 is a prime.

It is a super-2 number, since 2×26122027891² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26122027801) 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 5 ways as a sum of consecutive naturals, for example, 13590105 + ... + 13592026.

It is an arithmetic number, because the mean of its divisors is an integer number (4498642846).

Almost surely, 2^26122027891 is an apocalyptic number.

26122027891 is a deficient number, since it is larger than the sum of its proper divisors (869829185).

26122027891 is an equidigital number, since it uses as much as digits as its factorization.

26122027891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27182193 (or 27182162 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The spelling of 26122027891 in words is "twenty-six billion, one hundred twenty-two million, twenty-seven thousand, eight hundred ninety-one".