6689397149 has 2 divisors, whose sum is σ = 6689397150. Its totient is φ = 6689397148.

The previous prime is 6689397103. The next prime is 6689397161. The reversal of 6689397149 is 9417939866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6672439225 + 16957924 = 81685^2 + 4118^2 .

It is a cyclic number.

It is not a de Polignac number, because 6689397149 - 2¹⁶ = 6689331613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6689397091 and 6689397100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6689397179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3344698574 + 3344698575.

It is an arithmetic number, because the mean of its divisors is an integer number (3344698575).

Almost surely, 2^6689397149 is an apocalyptic number.

It is an amenable number.

6689397149 is a deficient number, since it is larger than the sum of its proper divisors (1).

6689397149 is an equidigital number, since it uses as much as digits as its factorization.

6689397149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17635968, while the sum is 62.

The square root of 6689397149 is about 81788.7348538905. The cubic root of 6689397149 is about 1884.2086515913.

The spelling of 6689397149 in words is "six billion, six hundred eighty-nine million, three hundred ninety-seven thousand, one hundred forty-nine".