206643949955 has 8 divisors (see below), whose sum is σ = 247997432592. Its totient is φ = 165298698208.

The previous prime is 206643949909. The next prime is 206643949979. The reversal of 206643949955 is 559949346602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206643949955 - 2⁶ = 206643949891 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2002352 + ... + 2103021.

It is an arithmetic number, because the mean of its divisors is an integer number (30999679074).

Almost surely, 2^206643949955 is an apocalyptic number.

206643949955 is a deficient number, since it is larger than the sum of its proper divisors (41353482637).

206643949955 is a wasteful number, since it uses less digits than its factorization.

206643949955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4115445.

The product of its (nonzero) digits is 62985600, while the sum is 62.

The spelling of 206643949955 in words is "two hundred six billion, six hundred forty-three million, nine hundred forty-nine thousand, nine hundred fifty-five".