11044720781 has 2 divisors, whose sum is σ = 11044720782. Its totient is φ = 11044720780.

The previous prime is 11044720759. The next prime is 11044720787. The reversal of 11044720781 is 18702744011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8207454025 + 2837266756 = 90595^2 + 53266^2 .

It is a cyclic number.

It is not a de Polignac number, because 11044720781 - 2¹⁰ = 11044719757 is a prime.

It is a super-2 number, since 2×11044720781² (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 (11044720787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5522360390 + 5522360391.

It is an arithmetic number, because the mean of its divisors is an integer number (5522360391).

Almost surely, 2^11044720781 is an apocalyptic number.

It is an amenable number.

11044720781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11044720781 is an equidigital number, since it uses as much as digits as its factorization.

11044720781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12544, while the sum is 35.

The spelling of 11044720781 in words is "eleven billion, forty-four million, seven hundred twenty thousand, seven hundred eighty-one".