649562773901 has 2 divisors, whose sum is σ = 649562773902. Its totient is φ = 649562773900.

The previous prime is 649562773823. The next prime is 649562773927. The reversal of 649562773901 is 109377265946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 586907677801 + 62655096100 = 766099^2 + 250310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649562773901 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649562773931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324781386950 + 324781386951.

It is an arithmetic number, because the mean of its divisors is an integer number (324781386951).

Almost surely, 2^649562773901 is an apocalyptic number.

It is an amenable number.

649562773901 is a deficient number, since it is larger than the sum of its proper divisors (1).

649562773901 is an equidigital number, since it uses as much as digits as its factorization.

649562773901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17146080, while the sum is 59.

The spelling of 649562773901 in words is "six hundred forty-nine billion, five hundred sixty-two million, seven hundred seventy-three thousand, nine hundred one".