206246001643 has 4 divisors (see below), whose sum is σ = 224995638168. Its totient is φ = 187496365120.

The previous prime is 206246001613. The next prime is 206246001659. The reversal of 206246001643 is 346100642602.

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

It is a cyclic number.

It is not a de Polignac number, because 206246001643 - 2⁹ = 206246001131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206246001599 and 206246001608.

It is not an unprimeable number, because it can be changed into a prime (206246001613) 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, 9374818246 + ... + 9374818267.

It is an arithmetic number, because the mean of its divisors is an integer number (56248909542).

Almost surely, 2^206246001643 is an apocalyptic number.

206246001643 is a deficient number, since it is larger than the sum of its proper divisors (18749636525).

206246001643 is a wasteful number, since it uses less digits than its factorization.

206246001643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18749636524.

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 206246001643 in words is "two hundred six billion, two hundred forty-six million, one thousand, six hundred forty-three".