206867865601 has 4 divisors (see below), whose sum is σ = 206878377172. Its totient is φ = 206857354032.

The previous prime is 206867865599. The next prime is 206867865623. The reversal of 206867865601 is 106568768602.

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 77986147600 + 128881718001 = 279260^2 + 359001^2 .

It is a cyclic number.

It is not a de Polignac number, because 206867865601 - 2¹ = 206867865599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206867865101) 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, 5226210 + ... + 5265643.

It is an arithmetic number, because the mean of its divisors is an integer number (51719594293).

Almost surely, 2^206867865601 is an apocalyptic number.

It is an amenable number.

206867865601 is a deficient number, since it is larger than the sum of its proper divisors (10511571).

206867865601 is a wasteful number, since it uses less digits than its factorization.

206867865601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10511570.

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 206867865601 in words is "two hundred six billion, eight hundred sixty-seven million, eight hundred sixty-five thousand, six hundred one".