11621061356549 has 2 divisors, whose sum is σ = 11621061356550. Its totient is φ = 11621061356548.

The previous prime is 11621061356447. The next prime is 11621061356581. The reversal of 11621061356549 is 94565316012611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11359933202500 + 261128154049 = 3370450^2 + 511007^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11621061356549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11621061356497 and 11621061356506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11621061355549) 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, 5810530678274 + 5810530678275.

It is an arithmetic number, because the mean of its divisors is an integer number (5810530678275).

Almost surely, 2^{11621061356549} is an apocalyptic number.

It is an amenable number.

11621061356549 is a deficient number, since it is larger than the sum of its proper divisors (1).

11621061356549 is an equidigital number, since it uses as much as digits as its factorization.

11621061356549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 11621061356549 in words is "eleven trillion, six hundred twenty-one billion, sixty-one million, three hundred fifty-six thousand, five hundred forty-nine".