11618506209649 has 2 divisors, whose sum is σ = 11618506209650. Its totient is φ = 11618506209648.

The previous prime is 11618506209587. The next prime is 11618506209743. The reversal of 11618506209649 is 94690260581611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8528181293025 + 3090324916624 = 2920305^2 + 1757932^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11618506209649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11618506209593 and 11618506209602.

It is not a weakly prime, because it can be changed into another prime (11618506299649) 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, 5809253104824 + 5809253104825.

It is an arithmetic number, because the mean of its divisors is an integer number (5809253104825).

Almost surely, 2^{11618506209649} is an apocalyptic number.

It is an amenable number.

11618506209649 is a deficient number, since it is larger than the sum of its proper divisors (1).

11618506209649 is an equidigital number, since it uses as much as digits as its factorization.

11618506209649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 58.

The spelling of 11618506209649 in words is "eleven trillion, six hundred eighteen billion, five hundred six million, two hundred nine thousand, six hundred forty-nine".