205404243320125 has 16 divisors (see below), whose sum is σ = 256361007681792. Its totient is φ = 164312810029200.

The previous prime is 205404243320099. The next prime is 205404243320153. The reversal of 205404243320125 is 521023342404502.

It is a happy number.

It is not a de Polignac number, because 205404243320125 - 2¹⁷ = 205404243189053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50974497 + ... + 54856246.

It is an arithmetic number, because the mean of its divisors is an integer number (16022562980112).

Almost surely, 2^{205404243320125} is an apocalyptic number.

205404243320125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205404243320125 is a deficient number, since it is larger than the sum of its proper divisors (50956764361667).

205404243320125 is a wasteful number, since it uses less digits than its factorization.

205404243320125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105846285 (or 105846275 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 37.

Adding to 205404243320125 its reverse (521023342404502), we get a palindrome (726427585724627).

The spelling of 205404243320125 in words is "two hundred five trillion, four hundred four billion, two hundred forty-three million, three hundred twenty thousand, one hundred twenty-five".