201666666 has 8 divisors (see below), whose sum is σ = 403333344. Its totient is φ = 67222220.

The previous prime is 201666653. The next prime is 201666683. The reversal of 201666666 is 666666102.

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

201666666 is an admirable number.

201666666 is a modest number, since divided by 66666 gives 2016 as remainder.

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, 16805550 + ... + 16805561.

It is an arithmetic number, because the mean of its divisors is an integer number (50416668).

Almost surely, 2^201666666 is an apocalyptic number.

201666666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201666666 is a wasteful number, since it uses less digits than its factorization.

201666666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33611116.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 201666666 is about 14200.9389126212. The cubic root of 201666666 is about 586.4235096976.

The spelling of 201666666 in words is "two hundred one million, six hundred sixty-six thousand, six hundred sixty-six".