205775117643 has 8 divisors (see below), whose sum is σ = 275882663056. Its totient is φ = 136425492000.

The previous prime is 205775117633. The next prime is 205775117663. The reversal of 205775117643 is 346711577502.

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

It is not a de Polignac number, because 205775117643 - 2⁶ = 205775117579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205775117592 and 205775117601.

It is not an unprimeable number, because it can be changed into a prime (205775117633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189479308 + ... + 189480393.

It is an arithmetic number, because the mean of its divisors is an integer number (34485332882).

Almost surely, 2^205775117643 is an apocalyptic number.

205775117643 is a deficient number, since it is larger than the sum of its proper divisors (70107545413).

205775117643 is a wasteful number, since it uses less digits than its factorization.

205775117643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378959885.

The product of its (nonzero) digits is 1234800, while the sum is 48.

The spelling of 205775117643 in words is "two hundred five billion, seven hundred seventy-five million, one hundred seventeen thousand, six hundred forty-three".