678220663 has 2 divisors, whose sum is σ = 678220664. Its totient is φ = 678220662.

The previous prime is 678220649. The next prime is 678220717. The reversal of 678220663 is 366022876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678220663 - 2¹³ = 678212471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678220633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339110331 + 339110332.

It is an arithmetic number, because the mean of its divisors is an integer number (339110332).

Almost surely, 2^678220663 is an apocalyptic number.

678220663 is a deficient number, since it is larger than the sum of its proper divisors (1).

678220663 is an equidigital number, since it uses as much as digits as its factorization.

678220663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 678220663 is about 26042.6700436034. The cubic root of 678220663 is about 878.5982603680.

The spelling of 678220663 in words is "six hundred seventy-eight million, two hundred twenty thousand, six hundred sixty-three".