206553310449 has 4 divisors (see below), whose sum is σ = 275404413936. Its totient is φ = 137702206964.

The previous prime is 206553310441. The next prime is 206553310499. The reversal of 206553310449 is 944013355602.

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 206553310449 - 2³ = 206553310441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206553310449.

It is not an unprimeable number, because it can be changed into a prime (206553310441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34425551739 + ... + 34425551744.

It is an arithmetic number, because the mean of its divisors is an integer number (68851103484).

Almost surely, 2^206553310449 is an apocalyptic number.

It is an amenable number.

206553310449 is a deficient number, since it is larger than the sum of its proper divisors (68851103487).

206553310449 is an equidigital number, since it uses as much as digits as its factorization.

206553310449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68851103486.

The product of its (nonzero) digits is 388800, while the sum is 42.

The spelling of 206553310449 in words is "two hundred six billion, five hundred fifty-three million, three hundred ten thousand, four hundred forty-nine".