205144914397 has 4 divisors (see below), whose sum is σ = 205350677596. Its totient is φ = 204939151200.

The previous prime is 205144914379. The next prime is 205144914407. The reversal of 205144914397 is 793419441502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 193119818116 + 12025096281 = 439454^2 + 109659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205144914397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205144914397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205144914367) 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, 102880104 + ... + 102882097.

It is an arithmetic number, because the mean of its divisors is an integer number (51337669399).

Almost surely, 2^205144914397 is an apocalyptic number.

It is an amenable number.

205144914397 is a deficient number, since it is larger than the sum of its proper divisors (205763199).

205144914397 is an equidigital number, since it uses as much as digits as its factorization.

205144914397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205763198.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 205144914397 in words is "two hundred five billion, one hundred forty-four million, nine hundred fourteen thousand, three hundred ninety-seven".