11593779220781 has 2 divisors, whose sum is σ = 11593779220782. Its totient is φ = 11593779220780.

The previous prime is 11593779220741. The next prime is 11593779220819. The reversal of 11593779220781 is 18702297739511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11301087400681 + 292691820100 = 3361709^2 + 541010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11593779220781 is a prime.

It is a super-2 number, since 2×11593779220781² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11593779220721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5796889610390 + 5796889610391.

It is an arithmetic number, because the mean of its divisors is an integer number (5796889610391).

Almost surely, 2^{11593779220781} is an apocalyptic number.

It is an amenable number.

11593779220781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11593779220781 is an equidigital number, since it uses as much as digits as its factorization.

11593779220781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13335840, while the sum is 62.

The spelling of 11593779220781 in words is "eleven trillion, five hundred ninety-three billion, seven hundred seventy-nine million, two hundred twenty thousand, seven hundred eighty-one".