1066643663 has 4 divisors (see below), whose sum is σ = 1075042560. Its totient is φ = 1058244768.

The previous prime is 1066643657. The next prime is 1066643687. The reversal of 1066643663 is 3663466601.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1066643663 is a prime.

It is a super-3 number, since 3×1066643663³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1066643663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066643063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4199258 + ... + 4199511.

It is an arithmetic number, because the mean of its divisors is an integer number (268760640).

Almost surely, 2^1066643663 is an apocalyptic number.

1066643663 is a deficient number, since it is larger than the sum of its proper divisors (8398897).

1066643663 is an equidigital number, since it uses as much as digits as its factorization.

1066643663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8398896.

The product of its (nonzero) digits is 279936, while the sum is 41.

The square root of 1066643663 is about 32659.5110649256. The cubic root of 1066643663 is about 1021.7385648358.

The spelling of 1066643663 in words is "one billion, sixty-six million, six hundred forty-three thousand, six hundred sixty-three".