206556053 has 4 divisors (see below), whose sum is σ = 225333888. Its totient is φ = 187778220.

The previous prime is 206556029. The next prime is 206556059. The reversal of 206556053 is 350655602.

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 206556053 - 2¹⁰ = 206555029 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 (206556059) 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, 9388901 + ... + 9388922.

It is an arithmetic number, because the mean of its divisors is an integer number (56333472).

Almost surely, 2^206556053 is an apocalyptic number.

It is an amenable number.

206556053 is a deficient number, since it is larger than the sum of its proper divisors (18777835).

206556053 is a wasteful number, since it uses less digits than its factorization.

206556053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18777834.

The product of its (nonzero) digits is 27000, while the sum is 32.

The square root of 206556053 is about 14372.0580641744. The cubic root of 206556053 is about 591.1249751212.

The spelling of 206556053 in words is "two hundred six million, five hundred fifty-six thousand, fifty-three".