206671840069 has 4 divisors (see below), whose sum is σ = 206709580044. Its totient is φ = 206634100096.

The previous prime is 206671840061. The next prime is 206671840087. The reversal of 206671840069 is 960048176602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 160312152100 + 46359687969 = 400390^2 + 215313^2 .

It is a cyclic number.

It is not a de Polignac number, because 206671840069 - 2³ = 206671840061 is a prime.

It is a super-2 number, since 2×206671840069² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206671840061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18861772 + ... + 18872725.

It is an arithmetic number, because the mean of its divisors is an integer number (51677395011).

Almost surely, 2^206671840069 is an apocalyptic number.

It is an amenable number.

206671840069 is a deficient number, since it is larger than the sum of its proper divisors (37739975).

206671840069 is an equidigital number, since it uses as much as digits as its factorization.

206671840069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37739974.

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 206671840069 in words is "two hundred six billion, six hundred seventy-one million, eight hundred forty thousand, sixty-nine".