665585543 has 4 divisors (see below), whose sum is σ = 760669200. Its totient is φ = 570501888.

The previous prime is 665585527. The next prime is 665585567. The reversal of 665585543 is 345585566.

665585543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 665585543 - 2⁴ = 665585527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665585573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47541818 + ... + 47541831.

It is an arithmetic number, because the mean of its divisors is an integer number (190167300).

Almost surely, 2^665585543 is an apocalyptic number.

665585543 is a deficient number, since it is larger than the sum of its proper divisors (95083657).

665585543 is an equidigital number, since it uses as much as digits as its factorization.

665585543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95083656.

The product of its digits is 2160000, while the sum is 47.

The square root of 665585543 is about 25798.9446101968. The cubic root of 665585543 is about 873.1079849821.

The spelling of 665585543 in words is "six hundred sixty-five million, five hundred eighty-five thousand, five hundred forty-three".