1066645563 has 4 divisors (see below), whose sum is σ = 1422194088. Its totient is φ = 711097040.

The previous prime is 1066645553. The next prime is 1066645577. The reversal of 1066645563 is 3655466601.

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

It is a cyclic number.

It is not a de Polignac number, because 1066645563 - 2²⁵ = 1033091131 is a prime.

It is a super-2 number, since 2×1066645563² = 2275465514135173938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1066645523) 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, 177774258 + ... + 177774263.

It is an arithmetic number, because the mean of its divisors is an integer number (355548522).

Almost surely, 2^1066645563 is an apocalyptic number.

1066645563 is a deficient number, since it is larger than the sum of its proper divisors (355548525).

1066645563 is an equidigital number, since it uses as much as digits as its factorization.

1066645563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355548524.

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 1066645563 is about 32659.5401529170. The cubic root of 1066645563 is about 1021.7391715058.

The spelling of 1066645563 in words is "one billion, sixty-six million, six hundred forty-five thousand, five hundred sixty-three".