11111335556609 has 2 divisors, whose sum is σ = 11111335556610. Its totient is φ = 11111335556608.

The previous prime is 11111335556599. The next prime is 11111335556701. The reversal of 11111335556609 is 90665553311111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6398355073009 + 4712980483600 = 2529497^2 + 2170940^2 .

It is an emirp because it is prime and its reverse (90665553311111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11111335556609 - 2⁸ = 11111335556353 is a prime.

It is not a weakly prime, because it can be changed into another prime (11111335556309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555667778304 + 5555667778305.

It is an arithmetic number, because the mean of its divisors is an integer number (5555667778305).

Almost surely, 2^{11111335556609} is an apocalyptic number.

It is an amenable number.

11111335556609 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111335556609 is an equidigital number, since it uses as much as digits as its factorization.

11111335556609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 364500, while the sum is 47.

The spelling of 11111335556609 in words is "eleven trillion, one hundred eleven billion, three hundred thirty-five million, five hundred fifty-six thousand, six hundred nine".