67663643849 has 2 divisors, whose sum is σ = 67663643850. Its totient is φ = 67663643848.

The previous prime is 67663643807. The next prime is 67663643851. The reversal of 67663643849 is 94834636676.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66271234624 + 1392409225 = 257432^2 + 37315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67663643849 is a prime.

Together with 67663643851, 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 = 67663643791 and 67663643800.

It is not a weakly prime, because it can be changed into another prime (67663643869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33831821924 + 33831821925.

It is an arithmetic number, because the mean of its divisors is an integer number (33831821925).

Almost surely, 2^67663643849 is an apocalyptic number.

It is an amenable number.

67663643849 is a deficient number, since it is larger than the sum of its proper divisors (1).

67663643849 is an equidigital number, since it uses as much as digits as its factorization.

67663643849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94058496, while the sum is 62.

The spelling of 67663643849 in words is "sixty-seven billion, six hundred sixty-three million, six hundred forty-three thousand, eight hundred forty-nine".