26191077481 has 2 divisors, whose sum is σ = 26191077482. Its totient is φ = 26191077480.

The previous prime is 26191077461. The next prime is 26191077581. The reversal of 26191077481 is 18477019162.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20415837456 + 5775240025 = 142884^2 + 75995^2 .

It is a cyclic number.

It is not a de Polignac number, because 26191077481 - 2¹¹ = 26191075433 is a prime.

It is a super-2 number, since 2×26191077481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (26191077461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13095538740 + 13095538741.

It is an arithmetic number, because the mean of its divisors is an integer number (13095538741).

Almost surely, 2^26191077481 is an apocalyptic number.

It is an amenable number.

26191077481 is a deficient number, since it is larger than the sum of its proper divisors (1).

26191077481 is an equidigital number, since it uses as much as digits as its factorization.

26191077481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 46.

The spelling of 26191077481 in words is "twenty-six billion, one hundred ninety-one million, seventy-seven thousand, four hundred eighty-one".