649697567 has 2 divisors, whose sum is σ = 649697568. Its totient is φ = 649697566.

The previous prime is 649697539. The next prime is 649697623. The reversal of 649697567 is 765796946.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649697567 - 2¹⁶ = 649632031 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649697507) 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, 324848783 + 324848784.

It is an arithmetic number, because the mean of its divisors is an integer number (324848784).

Almost surely, 2^649697567 is an apocalyptic number.

649697567 is a deficient number, since it is larger than the sum of its proper divisors (1).

649697567 is an equidigital number, since it uses as much as digits as its factorization.

649697567 is an odious number, because the sum of its binary digits is odd.

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

The square root of 649697567 is about 25489.1656787742. The cubic root of 649697567 is about 866.1047361444.

The spelling of 649697567 in words is "six hundred forty-nine million, six hundred ninety-seven thousand, five hundred sixty-seven".