26516543389649 has 2 divisors, whose sum is σ = 26516543389650. Its totient is φ = 26516543389648.

The previous prime is 26516543389607. The next prime is 26516543389717. The reversal of 26516543389649 is 94698334561562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21458573875600 + 5057969514049 = 4632340^2 + 2248993^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26516543389649 is a prime.

It is not a weakly prime, because it can be changed into another prime (26516543389249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13258271694824 + 13258271694825.

It is an arithmetic number, because the mean of its divisors is an integer number (13258271694825).

Almost surely, 2^{26516543389649} is an apocalyptic number.

It is an amenable number.

26516543389649 is a deficient number, since it is larger than the sum of its proper divisors (1).

26516543389649 is an equidigital number, since it uses as much as digits as its factorization.

26516543389649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1007769600, while the sum is 71.

The spelling of 26516543389649 in words is "twenty-six trillion, five hundred sixteen billion, five hundred forty-three million, three hundred eighty-nine thousand, six hundred forty-nine".