206556606506 has 16 divisors (see below), whose sum is σ = 342323993664. Its totient is φ = 92976886464.

The previous prime is 206556606491. The next prime is 206556606527. The reversal of 206556606506 is 605606655602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132068660 + ... + 132070223.

It is an arithmetic number, because the mean of its divisors is an integer number (21395249604).

Almost surely, 2^206556606506 is an apocalyptic number.

206556606506 is a deficient number, since it is larger than the sum of its proper divisors (135767387158).

206556606506 is a wasteful number, since it uses less digits than its factorization.

206556606506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264138925.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 206556606506 in words is "two hundred six billion, five hundred fifty-six million, six hundred six thousand, five hundred six".