206506550657 has 8 divisors (see below), whose sum is σ = 228452830272. Its totient is φ = 185089097200.

The previous prime is 206506550647. The next prime is 206506550759. The reversal of 206506550657 is 756055605602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206506550657 - 2⁸ = 206506550401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206506550647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132205718 + ... + 132207279.

It is an arithmetic number, because the mean of its divisors is an integer number (28556603784).

Almost surely, 2^206506550657 is an apocalyptic number.

It is an amenable number.

206506550657 is a deficient number, since it is larger than the sum of its proper divisors (21946279615).

206506550657 is a wasteful number, since it uses less digits than its factorization.

206506550657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264413079.

The product of its (nonzero) digits is 1890000, while the sum is 47.

The spelling of 206506550657 in words is "two hundred six billion, five hundred six million, five hundred fifty thousand, six hundred fifty-seven".