205575944649 has 4 divisors (see below), whose sum is σ = 274101259536. Its totient is φ = 137050629764.

The previous prime is 205575944513. The next prime is 205575944657. The reversal of 205575944649 is 946449575502.

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 205575944649 - 2¹³ = 205575936457 is a prime.

It is a super-2 number, since 2×205575944649² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205575944592 and 205575944601.

It is not an unprimeable number, because it can be changed into a prime (205575945649) 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, 34262657439 + ... + 34262657444.

It is an arithmetic number, because the mean of its divisors is an integer number (68525314884).

Almost surely, 2^205575944649 is an apocalyptic number.

It is an amenable number.

205575944649 is a deficient number, since it is larger than the sum of its proper divisors (68525314887).

205575944649 is an equidigital number, since it uses as much as digits as its factorization.

205575944649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68525314886.

The product of its (nonzero) digits is 54432000, while the sum is 60.

The spelling of 205575944649 in words is "two hundred five billion, five hundred seventy-five million, nine hundred forty-four thousand, six hundred forty-nine".