26191305487 has 2 divisors, whose sum is σ = 26191305488. Its totient is φ = 26191305486.

The previous prime is 26191305479. The next prime is 26191305577. The reversal of 26191305487 is 78450319162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26191305487 - 2³ = 26191305479 is a prime.

It is a super-2 number, since 2×26191305487² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26191305787) 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 as a sum of consecutive naturals, namely, 13095652743 + 13095652744.

It is an arithmetic number, because the mean of its divisors is an integer number (13095652744).

It is a 2-persistent number, because it is pandigital, and so is 2⋅26191305487 = 52382610974, but 3⋅26191305487 = 78573916461 is not.

Almost surely, 2^26191305487 is an apocalyptic number.

26191305487 is a deficient number, since it is larger than the sum of its proper divisors (1).

26191305487 is an equidigital number, since it uses as much as digits as its factorization.

26191305487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 26191305487 in words is "twenty-six billion, one hundred ninety-one million, three hundred five thousand, four hundred eighty-seven".