205235142562666 has 16 divisors (see below), whose sum is σ = 321239272990464. Its totient is φ = 98155430969904.

The previous prime is 205235142562663. The next prime is 205235142562711. The reversal of 205235142562666 is 666265241532502.

It is not an unprimeable number, because it can be changed into a prime (205235142562661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2434221 + ... + 20405776.

It is an arithmetic number, because the mean of its divisors is an integer number (20077454561904).

Almost surely, 2^{205235142562666} is an apocalyptic number.

205235142562666 is a deficient number, since it is larger than the sum of its proper divisors (116004130427798).

205235142562666 is a wasteful number, since it uses less digits than its factorization.

205235142562666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23035365.

The product of its (nonzero) digits is 31104000, while the sum is 55.

The spelling of 205235142562666 in words is "two hundred five trillion, two hundred thirty-five billion, one hundred forty-two million, five hundred sixty-two thousand, six hundred sixty-six".