663420377 has 2 divisors, whose sum is σ = 663420378. Its totient is φ = 663420376.

The previous prime is 663420343. The next prime is 663420389. The reversal of 663420377 is 773024366.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 663371536 + 48841 = 25756^2 + 221^2 .

It is a cyclic number.

It is not a de Polignac number, because 663420377 - 2⁶ = 663420313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 663420377.

It is not a weakly prime, because it can be changed into another prime (663420337) 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, 331710188 + 331710189.

It is an arithmetic number, because the mean of its divisors is an integer number (331710189).

Almost surely, 2^663420377 is an apocalyptic number.

It is an amenable number.

663420377 is a deficient number, since it is larger than the sum of its proper divisors (1).

663420377 is an equidigital number, since it uses as much as digits as its factorization.

663420377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 38.

The square root of 663420377 is about 25756.9481305530. The cubic root of 663420377 is about 872.1602093376.

The spelling of 663420377 in words is "six hundred sixty-three million, four hundred twenty thousand, three hundred seventy-seven".