206621025066 has 32 divisors (see below), whose sum is σ = 459173971200. Its totient is φ = 68871254400.

The previous prime is 206621025053. The next prime is 206621025131. The reversal of 206621025066 is 660520126602.

206621025066 is a `hidden beast` number, since 2 + 0 + 6 + 621 + 0 + 25 + 0 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 206621025066.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2160666 + ... + 2254266.

It is an arithmetic number, because the mean of its divisors is an integer number (14349186600).

Almost surely, 2^206621025066 is an apocalyptic number.

206621025066 is an abundant number, since it is smaller than the sum of its proper divisors (252552946134).

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

206621025066 is a wasteful number, since it uses less digits than its factorization.

206621025066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134491 (or 134485 counting only the distinct ones).

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

The spelling of 206621025066 in words is "two hundred six billion, six hundred twenty-one million, twenty-five thousand, sixty-six".