26854990847957 has 2 divisors, whose sum is σ = 26854990847958. Its totient is φ = 26854990847956.

The previous prime is 26854990847929. The next prime is 26854990848029. The reversal of 26854990847957 is 75974809945862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25139333599396 + 1715657248561 = 5013914^2 + 1309831^2 .

It is a cyclic number.

It is not a de Polignac number, because 26854990847957 - 2⁸ = 26854990847701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26854990847257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13427495423978 + 13427495423979.

It is an arithmetic number, because the mean of its divisors is an integer number (13427495423979).

Almost surely, 2^{26854990847957} is an apocalyptic number.

It is an amenable number.

26854990847957 is a deficient number, since it is larger than the sum of its proper divisors (1).

26854990847957 is an equidigital number, since it uses as much as digits as its factorization.

26854990847957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10973491200, while the sum is 83.

The spelling of 26854990847957 in words is "twenty-six trillion, eight hundred fifty-four billion, nine hundred ninety million, eight hundred forty-seven thousand, nine hundred fifty-seven".