206685071077 has 4 divisors (see below), whose sum is σ = 206882102700. Its totient is φ = 206488039456.

The previous prime is 206685071071. The next prime is 206685071149. The reversal of 206685071077 is 770170586602.

It is a happy number.

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 194376056161 + 12309014916 = 440881^2 + 110946^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206685071077 is a prime.

It is a super-2 number, since 2×206685071077² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 206685071077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206685071071) 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, 98514238 + ... + 98516335.

It is an arithmetic number, because the mean of its divisors is an integer number (51720525675).

Almost surely, 2^206685071077 is an apocalyptic number.

It is an amenable number.

206685071077 is a deficient number, since it is larger than the sum of its proper divisors (197031623).

206685071077 is a wasteful number, since it uses less digits than its factorization.

206685071077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197031622.

The product of its (nonzero) digits is 987840, while the sum is 49.

The spelling of 206685071077 in words is "two hundred six billion, six hundred eighty-five million, seventy-one thousand, seventy-seven".