206620656663 has 16 divisors (see below), whose sum is σ = 284567063552. Its totient is φ = 133216488000.

The previous prime is 206620656661. The next prime is 206620656673. The reversal of 206620656663 is 366656026602.

It is not a de Polignac number, because 206620656663 - 2¹ = 206620656661 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 (206620656661) 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, 583198 + ... + 867963.

It is an arithmetic number, because the mean of its divisors is an integer number (17785441472).

Almost surely, 2^206620656663 is an apocalyptic number.

206620656663 is a deficient number, since it is larger than the sum of its proper divisors (77946406889).

206620656663 is a wasteful number, since it uses less digits than its factorization.

206620656663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1452726.

The product of its (nonzero) digits is 2799360, while the sum is 48.

The spelling of 206620656663 in words is "two hundred six billion, six hundred twenty million, six hundred fifty-six thousand, six hundred sixty-three".