666789445 has 8 divisors (see below), whose sum is σ = 914454144. Its totient is φ = 457227024.

The previous prime is 666789443. The next prime is 666789451. The reversal of 666789445 is 544987666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666789445 - 2¹ = 666789443 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 (666789443) 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 7 ways as a sum of consecutive naturals, for example, 9525529 + ... + 9525598.

It is an arithmetic number, because the mean of its divisors is an integer number (114306768).

Almost surely, 2^666789445 is an apocalyptic number.

It is an amenable number.

666789445 is a deficient number, since it is larger than the sum of its proper divisors (247664699).

666789445 is a wasteful number, since it uses less digits than its factorization.

666789445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19051139.

The product of its digits is 8709120, while the sum is 55.

The square root of 666789445 is about 25822.2664574588. The cubic root of 666789445 is about 873.6340898212.

The spelling of 666789445 in words is "six hundred sixty-six million, seven hundred eighty-nine thousand, four hundred forty-five".