206629963909 has 4 divisors (see below), whose sum is σ = 207054255904. Its totient is φ = 206205671916.

The previous prime is 206629963849. The next prime is 206629963933. The reversal of 206629963909 is 909369926602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206629963909 - 2³⁵ = 172270225541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206629963609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212145267 + ... + 212146240.

It is an arithmetic number, because the mean of its divisors is an integer number (51763563976).

Almost surely, 2^206629963909 is an apocalyptic number.

It is an amenable number.

206629963909 is a deficient number, since it is larger than the sum of its proper divisors (424291995).

206629963909 is an equidigital number, since it uses as much as digits as its factorization.

206629963909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424291994.

The product of its (nonzero) digits is 17006112, while the sum is 61.

The spelling of 206629963909 in words is "two hundred six billion, six hundred twenty-nine million, nine hundred sixty-three thousand, nine hundred nine".