6722778989 has 2 divisors, whose sum is σ = 6722778990. Its totient is φ = 6722778988.

The previous prime is 6722778977. The next prime is 6722779067. The reversal of 6722778989 is 9898772276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5174356489 + 1548422500 = 71933^2 + 39350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6722778989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6722778919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3361389494 + 3361389495.

It is an arithmetic number, because the mean of its divisors is an integer number (3361389495).

Almost surely, 2^6722778989 is an apocalyptic number.

It is an amenable number.

6722778989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6722778989 is an equidigital number, since it uses as much as digits as its factorization.

6722778989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42674688, while the sum is 65.

The square root of 6722778989 is about 81992.5544729520. The cubic root of 6722778989 is about 1887.3376836517.

The spelling of 6722778989 in words is "six billion, seven hundred twenty-two million, seven hundred seventy-eight thousand, nine hundred eighty-nine".