201666766 has 16 divisors (see below), whose sum is σ = 347166720. Its totient is φ = 86065560.

The previous prime is 201666743. The next prime is 201666769. The reversal of 201666766 is 667666102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201666769) 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 7 ways as a sum of consecutive naturals, for example, 26790 + ... + 33481.

It is an arithmetic number, because the mean of its divisors is an integer number (21697920).

Almost surely, 2^201666766 is an apocalyptic number.

201666766 is a deficient number, since it is larger than the sum of its proper divisors (145499954).

201666766 is a wasteful number, since it uses less digits than its factorization.

201666766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60519.

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

The square root of 201666766 is about 14200.9424335148. The cubic root of 201666766 is about 586.4236066271.

The spelling of 201666766 in words is "two hundred one million, six hundred sixty-six thousand, seven hundred sixty-six".