206566665078 has 16 divisors (see below), whose sum is σ = 413156939760. Its totient is φ = 68851620096.

The previous prime is 206566665037. The next prime is 206566665089. The reversal of 206566665078 is 870566665602.

206566665078 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×206566665078³ (a number of 35 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 868963 + ... + 1080846.

It is an arithmetic number, because the mean of its divisors is an integer number (25822308735).

Almost surely, 2^206566665078 is an apocalyptic number.

206566665078 is an abundant number, since it is smaller than the sum of its proper divisors (206590274682).

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

206566665078 is a wasteful number, since it uses less digits than its factorization.

206566665078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1967471.

The product of its (nonzero) digits is 21772800, while the sum is 57.

The spelling of 206566665078 in words is "two hundred six billion, five hundred sixty-six million, six hundred sixty-five thousand, seventy-eight".