1200665563 has 2 divisors, whose sum is σ = 1200665564. Its totient is φ = 1200665562.

The previous prime is 1200665561. The next prime is 1200665581. The reversal of 1200665563 is 3655660021.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1200665563 - 2¹ = 1200665561 is a prime.

Together with 1200665561, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1200665561) 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, 600332781 + 600332782.

It is an arithmetic number, because the mean of its divisors is an integer number (600332782).

Almost surely, 2^1200665563 is an apocalyptic number.

1200665563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200665563 is an equidigital number, since it uses as much as digits as its factorization.

1200665563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 1200665563 is about 34650.6213941395. The cubic root of 1200665563 is about 1062.8549957124.

The spelling of 1200665563 in words is "one billion, two hundred million, six hundred sixty-five thousand, five hundred sixty-three".