206666313655 has 8 divisors (see below), whose sum is σ = 252065143584. Its totient is φ = 162622672800.

The previous prime is 206666313593. The next prime is 206666313683. The reversal of 206666313655 is 556313666602.

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

It is not a de Polignac number, because 206666313655 - 2⁷ = 206666313527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206666313599 and 206666313608.

It is a congruent number.

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, 338796931 + ... + 338797540.

It is an arithmetic number, because the mean of its divisors is an integer number (31508142948).

Almost surely, 2^206666313655 is an apocalyptic number.

206666313655 is a deficient number, since it is larger than the sum of its proper divisors (45398829929).

206666313655 is an equidigital number, since it uses as much as digits as its factorization.

206666313655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677594537.

The product of its (nonzero) digits is 3499200, while the sum is 49.

The spelling of 206666313655 in words is "two hundred six billion, six hundred sixty-six million, three hundred thirteen thousand, six hundred fifty-five".