431213666 has 8 divisors (see below), whose sum is σ = 696575964. Its totient is φ = 199021680.

The previous prime is 431213659. The next prime is 431213677. The reversal of 431213666 is 666312134.

It can be written as a sum of positive squares in 2 ways, for example, as 418816225 + 12397441 = 20465^2 + 3521^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8292545 + ... + 8292596.

Almost surely, 2^431213666 is an apocalyptic number.

431213666 is a deficient number, since it is larger than the sum of its proper divisors (265362298).

431213666 is a wasteful number, since it uses less digits than its factorization.

431213666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16585156.

The product of its digits is 15552, while the sum is 32.

The square root of 431213666 is about 20765.6848189507. The cubic root of 431213666 is about 755.4936852724.

The spelling of 431213666 in words is "four hundred thirty-one million, two hundred thirteen thousand, six hundred sixty-six".