205945288991 has 8 divisors (see below), whose sum is σ = 221833516800. Its totient is φ = 190063672992.

The previous prime is 205945288933. The next prime is 205945288999. The reversal of 205945288991 is 199882549502.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 205945288991 - 2²² = 205941094687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205945288999) 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, 1588160 + ... + 1712933.

It is an arithmetic number, because the mean of its divisors is an integer number (27729189600).

Almost surely, 2^205945288991 is an apocalyptic number.

205945288991 is a deficient number, since it is larger than the sum of its proper divisors (15888227809).

205945288991 is a wasteful number, since it uses less digits than its factorization.

205945288991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305905.

The product of its (nonzero) digits is 18662400, while the sum is 62.

The spelling of 205945288991 in words is "two hundred five billion, nine hundred forty-five million, two hundred eighty-eight thousand, nine hundred ninety-one".