206702417081 has 4 divisors (see below), whose sum is σ = 212288968932. Its totient is φ = 201115865232.

The previous prime is 206702417069. The next prime is 206702417083. The reversal of 206702417081 is 180714207602.

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 185122807081 + 21579610000 = 430259^2 + 146900^2 .

It is a cyclic number.

It is not a de Polignac number, because 206702417081 - 2⁶ = 206702417017 is a prime.

It is a super-2 number, since 2×206702417081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (206702417083) 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, 2793275870 + ... + 2793275943.

It is an arithmetic number, because the mean of its divisors is an integer number (53072242233).

Almost surely, 2^206702417081 is an apocalyptic number.

It is an amenable number.

206702417081 is a deficient number, since it is larger than the sum of its proper divisors (5586551851).

206702417081 is an equidigital number, since it uses as much as digits as its factorization.

206702417081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5586551850.

The product of its (nonzero) digits is 37632, while the sum is 38.

The spelling of 206702417081 in words is "two hundred six billion, seven hundred two million, four hundred seventeen thousand, eighty-one".