186668686837 has 2 divisors, whose sum is σ = 186668686838. Its totient is φ = 186668686836.

The previous prime is 186668686823. The next prime is 186668686843. The reversal of 186668686837 is 738686866681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185128830756 + 1539856081 = 430266^2 + 39241^2 .

It is an emirp because it is prime and its reverse (738686866681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 186668686837 - 2¹¹ = 186668684789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 186668686837.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (186668686817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93334343418 + 93334343419.

It is an arithmetic number, because the mean of its divisors is an integer number (93334343419).

Almost surely, 2^186668686837 is an apocalyptic number.

It is an amenable number.

186668686837 is a deficient number, since it is larger than the sum of its proper divisors (1).

186668686837 is an equidigital number, since it uses as much as digits as its factorization.

186668686837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 668860416, while the sum is 73.

The spelling of 186668686837 in words is "one hundred eighty-six billion, six hundred sixty-eight million, six hundred eighty-six thousand, eight hundred thirty-seven".