186806735981 has 2 divisors, whose sum is σ = 186806735982. Its totient is φ = 186806735980.

The previous prime is 186806735939. The next prime is 186806736029. The reversal of 186806735981 is 189537608681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186718187881 + 88548100 = 432109^2 + 9410^2 .

It is a cyclic number.

It is not a de Polignac number, because 186806735981 - 2¹⁰ = 186806734957 is a prime.

It is a super-2 number, since 2×186806735981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (186806735281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93403367990 + 93403367991.

It is an arithmetic number, because the mean of its divisors is an integer number (93403367991).

Almost surely, 2^186806735981 is an apocalyptic number.

It is an amenable number.

186806735981 is a deficient number, since it is larger than the sum of its proper divisors (1).

186806735981 is an equidigital number, since it uses as much as digits as its factorization.

186806735981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17418240, while the sum is 62.

The spelling of 186806735981 in words is "one hundred eighty-six billion, eight hundred six million, seven hundred thirty-five thousand, nine hundred eighty-one".