666306443 has 4 divisors (see below), whose sum is σ = 726879768. Its totient is φ = 605733120.

The previous prime is 666306439. The next prime is 666306469. The reversal of 666306443 is 344603666.

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 666306443 - 2² = 666306439 is a prime.

It is a super-3 number, since 3×666306443³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666306397 and 666306406.

It is not an unprimeable number, because it can be changed into a prime (666300443) 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 in 3 ways as a sum of consecutive naturals, for example, 30286646 + ... + 30286667.

It is an arithmetic number, because the mean of its divisors is an integer number (181719942).

Almost surely, 2^666306443 is an apocalyptic number.

666306443 is a deficient number, since it is larger than the sum of its proper divisors (60573325).

666306443 is a wasteful number, since it uses less digits than its factorization.

666306443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60573324.

The product of its (nonzero) digits is 186624, while the sum is 38.

The square root of 666306443 is about 25812.9123308471. The cubic root of 666306443 is about 873.4230942095.

The spelling of 666306443 in words is "six hundred sixty-six million, three hundred six thousand, four hundred forty-three".