201666667 has 4 divisors (see below), whose sum is σ = 208620720. Its totient is φ = 194712616.

The previous prime is 201666653. The next prime is 201666683. The reversal of 201666667 is 766666102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201666667 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201666607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3476983 + ... + 3477040.

It is an arithmetic number, because the mean of its divisors is an integer number (52155180).

Almost surely, 2^201666667 is an apocalyptic number.

201666667 is a deficient number, since it is larger than the sum of its proper divisors (6954053).

201666667 is an equidigital number, since it uses as much as digits as its factorization.

201666667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6954052.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 201666667 is about 14200.9389478302. The cubic root of 201666667 is about 586.4235106669.

The spelling of 201666667 in words is "two hundred one million, six hundred sixty-six thousand, six hundred sixty-seven".