6673781549 has 2 divisors, whose sum is σ = 6673781550. Its totient is φ = 6673781548.

The previous prime is 6673781539. The next prime is 6673781551. The reversal of 6673781549 is 9451873766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3396791524 + 3276990025 = 58282^2 + 57245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6673781549 is a prime.

Together with 6673781551, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6673781494 and 6673781503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6673781539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3336890774 + 3336890775.

It is an arithmetic number, because the mean of its divisors is an integer number (3336890775).

Almost surely, 2^6673781549 is an apocalyptic number.

It is an amenable number.

6673781549 is a deficient number, since it is larger than the sum of its proper divisors (1).

6673781549 is an equidigital number, since it uses as much as digits as its factorization.

6673781549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 56.

The square root of 6673781549 is about 81693.2160524973. The cubic root of 6673781549 is about 1882.7413557814.

The spelling of 6673781549 in words is "six billion, six hundred seventy-three million, seven hundred eighty-one thousand, five hundred forty-nine".