205813460655 has 64 divisors (see below), whose sum is σ = 400304678400. Its totient is φ = 99500520960.

The previous prime is 205813460651. The next prime is 205813460711. The reversal of 205813460655 is 556064318502.

205813460655 is a `hidden beast` number, since 2 + 0 + 5 + 8 + 1 + 34 + 606 + 5 + 5 = 666.

It is not a de Polignac number, because 205813460655 - 2² = 205813460651 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 205813460655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205813460651) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 315591 + ... + 714999.

It is an arithmetic number, because the mean of its divisors is an integer number (6254760600).

Almost surely, 2^205813460655 is an apocalyptic number.

205813460655 is a deficient number, since it is larger than the sum of its proper divisors (194491217745).

205813460655 is a wasteful number, since it uses less digits than its factorization.

205813460655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399781 (or 399775 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 205813460655 in words is "two hundred five billion, eight hundred thirteen million, four hundred sixty thousand, six hundred fifty-five".