11822064781 has 2 divisors, whose sum is σ = 11822064782. Its totient is φ = 11822064780.

The previous prime is 11822064743. The next prime is 11822064817. The reversal of 11822064781 is 18746022811.

Together with next prime (11822064817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11706158025 + 115906756 = 108195^2 + 10766^2 .

It is a cyclic number.

It is not a de Polignac number, because 11822064781 - 2²⁷ = 11687847053 is a prime.

It is a super-2 number, since 2×11822064781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11822064701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5911032390 + 5911032391.

It is an arithmetic number, because the mean of its divisors is an integer number (5911032391).

Almost surely, 2^11822064781 is an apocalyptic number.

It is an amenable number.

11822064781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11822064781 is an equidigital number, since it uses as much as digits as its factorization.

11822064781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 40.

The spelling of 11822064781 in words is "eleven billion, eight hundred twenty-two million, sixty-four thousand, seven hundred eighty-one".