11861686789 has 2 divisors, whose sum is σ = 11861686790. Its totient is φ = 11861686788.

The previous prime is 11861686747. The next prime is 11861686813. The reversal of 11861686789 is 98768616811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7311105025 + 4550581764 = 85505^2 + 67458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11861686789 is a prime.

It is a super-2 number, since 2×11861686789² (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 (11861686189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5930843394 + 5930843395.

It is an arithmetic number, because the mean of its divisors is an integer number (5930843395).

Almost surely, 2^11861686789 is an apocalyptic number.

It is an amenable number.

11861686789 is a deficient number, since it is larger than the sum of its proper divisors (1).

11861686789 is an equidigital number, since it uses as much as digits as its factorization.

11861686789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 61.

The spelling of 11861686789 in words is "eleven billion, eight hundred sixty-one million, six hundred eighty-six thousand, seven hundred eighty-nine".