6738684649 has 2 divisors, whose sum is σ = 6738684650. Its totient is φ = 6738684648.

The previous prime is 6738684619. The next prime is 6738684697. The reversal of 6738684649 is 9464868376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3584177424 + 3154507225 = 59868^2 + 56165^2 .

It is a cyclic number.

It is not a de Polignac number, because 6738684649 - 2⁷ = 6738684521 is a prime.

It is not a weakly prime, because it can be changed into another prime (6738684619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3369342324 + 3369342325.

It is an arithmetic number, because the mean of its divisors is an integer number (3369342325).

Almost surely, 2^6738684649 is an apocalyptic number.

It is an amenable number.

6738684649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6738684649 is an equidigital number, since it uses as much as digits as its factorization.

6738684649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41803776, while the sum is 61.

The square root of 6738684649 is about 82089.4917087443. The cubic root of 6738684649 is about 1888.8249509462.

The spelling of 6738684649 in words is "six billion, seven hundred thirty-eight million, six hundred eighty-four thousand, six hundred forty-nine".