11118645781 has 2 divisors, whose sum is σ = 11118645782. Its totient is φ = 11118645780.

The previous prime is 11118645767. The next prime is 11118645799. The reversal of 11118645781 is 18754681111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10668824100 + 449821681 = 103290^2 + 21209^2 .

It is a cyclic number.

It is not a de Polignac number, because 11118645781 - 2²³ = 11110257173 is a prime.

It is a super-2 number, since 2×11118645781² (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 (11118645731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5559322890 + 5559322891.

It is an arithmetic number, because the mean of its divisors is an integer number (5559322891).

Almost surely, 2^11118645781 is an apocalyptic number.

It is an amenable number.

11118645781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11118645781 is an equidigital number, since it uses as much as digits as its factorization.

11118645781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 43.

The spelling of 11118645781 in words is "eleven billion, one hundred eighteen million, six hundred forty-five thousand, seven hundred eighty-one".