10866389861 has 2 divisors, whose sum is σ = 10866389862. Its totient is φ = 10866389860.

The previous prime is 10866389837. The next prime is 10866389867. The reversal of 10866389861 is 16898366801.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10093216225 + 773173636 = 100465^2 + 27806^2 .

It is a cyclic number.

It is not a de Polignac number, because 10866389861 - 2²⁶ = 10799280997 is a prime.

It is a super-2 number, since 2×10866389861² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 10866389797 and 10866389806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10866389867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5433194930 + 5433194931.

It is an arithmetic number, because the mean of its divisors is an integer number (5433194931).

Almost surely, 2^10866389861 is an apocalyptic number.

It is an amenable number.

10866389861 is a deficient number, since it is larger than the sum of its proper divisors (1).

10866389861 is an equidigital number, since it uses as much as digits as its factorization.

10866389861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2985984, while the sum is 56.

The spelling of 10866389861 in words is "ten billion, eight hundred sixty-six million, three hundred eighty-nine thousand, eight hundred sixty-one".