1666416211 has 8 divisors (see below), whose sum is σ = 1770815520. Its totient is φ = 1562725248.

The previous prime is 1666416209. The next prime is 1666416247. The reversal of 1666416211 is 1126146661.

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 1666416211 - 2¹ = 1666416209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666416511) 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, 172231 + ... + 181648.

It is an arithmetic number, because the mean of its divisors is an integer number (221351940).

Almost surely, 2^1666416211 is an apocalyptic number.

1666416211 is a deficient number, since it is larger than the sum of its proper divisors (104399309).

1666416211 is a wasteful number, since it uses less digits than its factorization.

1666416211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354173.

The product of its digits is 10368, while the sum is 34.

The square root of 1666416211 is about 40821.7614882063. The cubic root of 1666416211 is about 1185.5717089160.

The spelling of 1666416211 in words is "one billion, six hundred sixty-six million, four hundred sixteen thousand, two hundred eleven".