666643411 has 8 divisors (see below), whose sum is σ = 767695104. Its totient is φ = 567045960.

The previous prime is 666643409. The next prime is 666643421. The reversal of 666643411 is 114346666.

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 666643411 - 2¹ = 666643409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666643421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 362575 + ... + 364408.

It is an arithmetic number, because the mean of its divisors is an integer number (95961888).

Almost surely, 2^666643411 is an apocalyptic number.

666643411 is a deficient number, since it is larger than the sum of its proper divisors (101051693).

666643411 is a wasteful number, since it uses less digits than its factorization.

666643411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727121.

The product of its digits is 62208, while the sum is 37.

The square root of 666643411 is about 25819.4386267401. The cubic root of 666643411 is about 873.5703067701.

The spelling of 666643411 in words is "six hundred sixty-six million, six hundred forty-three thousand, four hundred eleven".