26815451591 has 2 divisors, whose sum is σ = 26815451592. Its totient is φ = 26815451590.

The previous prime is 26815451573. The next prime is 26815451651. The reversal of 26815451591 is 19515451862.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26815451591 - 2⁶ = 26815451527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26815451501) 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, 13407725795 + 13407725796.

It is an arithmetic number, because the mean of its divisors is an integer number (13407725796).

Almost surely, 2^26815451591 is an apocalyptic number.

26815451591 is a deficient number, since it is larger than the sum of its proper divisors (1).

26815451591 is an equidigital number, since it uses as much as digits as its factorization.

26815451591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 47.

The spelling of 26815451591 in words is "twenty-six billion, eight hundred fifteen million, four hundred fifty-one thousand, five hundred ninety-one".