206556605671 has 16 divisors (see below), whose sum is σ = 228093232864. Its totient is φ = 185885466624.

The previous prime is 206556605663. The next prime is 206556605677. The reversal of 206556605671 is 176506655602.

It is not a de Polignac number, because 206556605671 - 2³ = 206556605663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206556605677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1137930 + ... + 1306903.

It is an arithmetic number, because the mean of its divisors is an integer number (14255827054).

Almost surely, 2^206556605671 is an apocalyptic number.

206556605671 is a deficient number, since it is larger than the sum of its proper divisors (21536627193).

206556605671 is a wasteful number, since it uses less digits than its factorization.

206556605671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445010.

The product of its (nonzero) digits is 2268000, while the sum is 49.

The spelling of 206556605671 in words is "two hundred six billion, five hundred fifty-six million, six hundred five thousand, six hundred seventy-one".