67844044789 has 2 divisors, whose sum is σ = 67844044790. Its totient is φ = 67844044788.

The previous prime is 67844044787. The next prime is 67844044883. The reversal of 67844044789 is 98744044876.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57895578225 + 9948466564 = 240615^2 + 99742^2 .

It is a cyclic number.

It is not a de Polignac number, because 67844044789 - 2¹ = 67844044787 is a prime.

Together with 67844044787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67844044787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33922022394 + 33922022395.

It is an arithmetic number, because the mean of its divisors is an integer number (33922022395).

Almost surely, 2^67844044789 is an apocalyptic number.

It is an amenable number.

67844044789 is a deficient number, since it is larger than the sum of its proper divisors (1).

67844044789 is an equidigital number, since it uses as much as digits as its factorization.

67844044789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43352064, while the sum is 61.

The spelling of 67844044789 in words is "sixty-seven billion, eight hundred forty-four million, forty-four thousand, seven hundred eighty-nine".