205146666 has 12 divisors (see below), whose sum is σ = 444484482. Its totient is φ = 68382216.

The previous prime is 205146661. The next prime is 205146703. The reversal of 205146666 is 666641502.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 118265625 + 86881041 = 10875^2 + 9321^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 205146666.

It is not an unprimeable number, because it can be changed into a prime (205146661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5698501 + ... + 5698536.

Almost surely, 2^205146666 is an apocalyptic number.

205146666 is an abundant number, since it is smaller than the sum of its proper divisors (239337816).

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

205146666 is a wasteful number, since it uses less digits than its factorization.

205146666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11397045 (or 11397042 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 205146666 is about 14322.9419464019. The cubic root of 205146666 is about 589.7774378397. Note that the first 3 decimals are identical.

The spelling of 205146666 in words is "two hundred five million, one hundred forty-six thousand, six hundred sixty-six".