205668086977 has 4 divisors (see below), whose sum is σ = 206899632576. Its totient is φ = 204436541380.

The previous prime is 205668086969. The next prime is 205668086999. The reversal of 205668086977 is 779680866502.

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 205668086977 - 2³ = 205668086969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205668083977) 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, 615772549 + ... + 615772882.

It is an arithmetic number, because the mean of its divisors is an integer number (51724908144).

Almost surely, 2^205668086977 is an apocalyptic number.

It is an amenable number.

205668086977 is a deficient number, since it is larger than the sum of its proper divisors (1231545599).

205668086977 is a wasteful number, since it uses less digits than its factorization.

205668086977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231545598.

The product of its (nonzero) digits is 60963840, while the sum is 64.

The spelling of 205668086977 in words is "two hundred five billion, six hundred sixty-eight million, eighty-six thousand, nine hundred seventy-seven".