649563377 has 2 divisors, whose sum is σ = 649563378. Its totient is φ = 649563376.

The previous prime is 649563371. The next prime is 649563403. The reversal of 649563377 is 773365946.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 489692641 + 159870736 = 22129^2 + 12644^2 .

It is a cyclic number.

It is not a de Polignac number, because 649563377 - 2⁸ = 649563121 is a prime.

It is not a weakly prime, because it can be changed into another prime (649563371) 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, 324781688 + 324781689.

It is an arithmetic number, because the mean of its divisors is an integer number (324781689).

Almost surely, 2^649563377 is an apocalyptic number.

It is an amenable number.

649563377 is a deficient number, since it is larger than the sum of its proper divisors (1).

649563377 is an equidigital number, since it uses as much as digits as its factorization.

649563377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2857680, while the sum is 50.

The square root of 649563377 is about 25486.5332479723. The cubic root of 649563377 is about 866.0451029638.

The spelling of 649563377 in words is "six hundred forty-nine million, five hundred sixty-three thousand, three hundred seventy-seven".