26335616654561 has 2 divisors, whose sum is σ = 26335616654562. Its totient is φ = 26335616654560.

The previous prime is 26335616654551. The next prime is 26335616654647. The reversal of 26335616654561 is 16545661653362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16835388579025 + 9500228075536 = 4103095^2 + 3082244^2 .

It is a cyclic number.

It is not a de Polignac number, because 26335616654561 - 2¹⁰ = 26335616653537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26335616654561.

It is not a weakly prime, because it can be changed into another prime (26335616654551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13167808327280 + 13167808327281.

It is an arithmetic number, because the mean of its divisors is an integer number (13167808327281).

Almost surely, 2^{26335616654561} is an apocalyptic number.

It is an amenable number.

26335616654561 is a deficient number, since it is larger than the sum of its proper divisors (1).

26335616654561 is an equidigital number, since it uses as much as digits as its factorization.

26335616654561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984000, while the sum is 59.

The spelling of 26335616654561 in words is "twenty-six trillion, three hundred thirty-five billion, six hundred sixteen million, six hundred fifty-four thousand, five hundred sixty-one".