206605878890 has 16 divisors (see below), whose sum is σ = 378907386408. Its totient is φ = 81083061696.

The previous prime is 206605878859. The next prime is 206605878929. The reversal of 206605878890 is 98878506602.

It can be written as a sum of positive squares in 4 ways, for example, as 151982242801 + 54623636089 = 389849^2 + 233717^2 .

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, 194910677 + ... + 194911736.

Almost surely, 2^206605878890 is an apocalyptic number.

206605878890 is a deficient number, since it is larger than the sum of its proper divisors (172301507518).

206605878890 is a wasteful number, since it uses less digits than its factorization.

206605878890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389822473.

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 206605878890 in words is "two hundred six billion, six hundred five million, eight hundred seventy-eight thousand, eight hundred ninety".