205893812947 has 4 divisors (see below), whose sum is σ = 205894937160. Its totient is φ = 205892688736.

The previous prime is 205893812909. The next prime is 205893812977. The reversal of 205893812947 is 749218398502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205893812947 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205893812891 and 205893812900.

It is not an unprimeable number, because it can be changed into a prime (205893812977) 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, 216598 + ... + 677275.

It is an arithmetic number, because the mean of its divisors is an integer number (51473734290).

Almost surely, 2^205893812947 is an apocalyptic number.

205893812947 is a deficient number, since it is larger than the sum of its proper divisors (1124213).

205893812947 is an equidigital number, since it uses as much as digits as its factorization.

205893812947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124212.

The product of its (nonzero) digits is 8709120, while the sum is 58.

The spelling of 205893812947 in words is "two hundred five billion, eight hundred ninety-three million, eight hundred twelve thousand, nine hundred forty-seven".