6689144953 has 2 divisors, whose sum is σ = 6689144954. Its totient is φ = 6689144952.

The previous prime is 6689144933. The next prime is 6689144971. The reversal of 6689144953 is 3594419866.

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., 6119463529 + 569681424 = 78227^2 + 23868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6689144953 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6689144894 and 6689144903.

It is not a weakly prime, because it can be changed into another prime (6689144933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3344572476 + 3344572477.

It is an arithmetic number, because the mean of its divisors is an integer number (3344572477).

Almost surely, 2^6689144953 is an apocalyptic number.

It is an amenable number.

6689144953 is a deficient number, since it is larger than the sum of its proper divisors (1).

6689144953 is an equidigital number, since it uses as much as digits as its factorization.

6689144953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 55.

The square root of 6689144953 is about 81787.1930866930. The cubic root of 6689144953 is about 1884.1849725340.

The spelling of 6689144953 in words is "six billion, six hundred eighty-nine million, one hundred forty-four thousand, nine hundred fifty-three".