206159478785 has 32 divisors (see below), whose sum is σ = 276132706080. Its totient is φ = 146767085568.

The previous prime is 206159478781. The next prime is 206159478797. The reversal of 206159478785 is 587874951602.

It can be written as a sum of positive squares in 16 ways, for example, as 7935959056 + 198223519729 = 89084^2 + 445223^2 .

It is a cyclic number.

It is not a de Polignac number, because 206159478785 - 2² = 206159478781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206159478781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131072 + ... + 655361.

It is an arithmetic number, because the mean of its divisors is an integer number (8629147065).

It is a Proth number, since it is equal to 196609 ⋅ 2²⁰ + 1 and 196609 < 2²⁰.

Almost surely, 2^206159478785 is an apocalyptic number.

206159478785 is the 262145-th octagonal number.

It is an amenable number.

206159478785 is a deficient number, since it is larger than the sum of its proper divisors (69973227295).

206159478785 is a wasteful number, since it uses less digits than its factorization.

206159478785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786597.

The product of its (nonzero) digits is 33868800, while the sum is 62.

The spelling of 206159478785 in words is "two hundred six billion, one hundred fifty-nine million, four hundred seventy-eight thousand, seven hundred eighty-five".