205691212968 has 64 divisors (see below), whose sum is σ = 544594613760. Its totient is φ = 64603847616.

The previous prime is 205691212949. The next prime is 205691212997. The reversal of 205691212968 is 869212196502.

205691212968 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 205691212968.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2743830 + ... + 2817797.

It is an arithmetic number, because the mean of its divisors is an integer number (8509290840).

Almost surely, 2^205691212968 is an apocalyptic number.

It is an amenable number.

205691212968 is an abundant number, since it is smaller than the sum of its proper divisors (338903400792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205691212968 is a wasteful number, since it uses less digits than its factorization.

205691212968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561726 (or 5561722 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 51.

The spelling of 205691212968 in words is "two hundred five billion, six hundred ninety-one million, two hundred twelve thousand, nine hundred sixty-eight".