11785693549781 has 2 divisors, whose sum is σ = 11785693549782. Its totient is φ = 11785693549780.

The previous prime is 11785693549753. The next prime is 11785693549859. The reversal of 11785693549781 is 18794539658711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11696571000625 + 89122549156 = 3420025^2 + 298534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11785693549781 is a prime.

It is a super-2 number, since 2×11785693549781² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11785693549699 and 11785693549708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11785693549741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5892846774890 + 5892846774891.

It is an arithmetic number, because the mean of its divisors is an integer number (5892846774891).

Almost surely, 2^{11785693549781} is an apocalyptic number.

It is an amenable number.

11785693549781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11785693549781 is an equidigital number, since it uses as much as digits as its factorization.

11785693549781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 457228800, while the sum is 74.

The spelling of 11785693549781 in words is "eleven trillion, seven hundred eighty-five billion, six hundred ninety-three million, five hundred forty-nine thousand, seven hundred eighty-one".