649195663 has 2 divisors, whose sum is σ = 649195664. Its totient is φ = 649195662.

The previous prime is 649195661. The next prime is 649195669. The reversal of 649195663 is 366591946.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649195663 - 2¹ = 649195661 is a prime.

Together with 649195661, 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 (649195661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324597831 + 324597832.

It is an arithmetic number, because the mean of its divisors is an integer number (324597832).

Almost surely, 2^649195663 is an apocalyptic number.

649195663 is a deficient number, since it is larger than the sum of its proper divisors (1).

649195663 is an equidigital number, since it uses as much as digits as its factorization.

649195663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 49.

The square root of 649195663 is about 25479.3183386055. The cubic root of 649195663 is about 865.8816511070.

The spelling of 649195663 in words is "six hundred forty-nine million, one hundred ninety-five thousand, six hundred sixty-three".