205125516425 has 6 divisors (see below), whose sum is σ = 254355640398. Its totient is φ = 164100413120.

The previous prime is 205125516361. The next prime is 205125516443. The reversal of 205125516425 is 524615521502.

It can be written as a sum of positive squares in 3 ways, for example, as 25644499321 + 179481017104 = 160139^2 + 423652^2 .

It is not a de Polignac number, because 205125516425 - 2⁶ = 205125516361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4102510304 + ... + 4102510353.

It is an arithmetic number, because the mean of its divisors is an integer number (42392606733).

Almost surely, 2^205125516425 is an apocalyptic number.

205125516425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205125516425 is a deficient number, since it is larger than the sum of its proper divisors (49230123973).

205125516425 is an equidigital number, since it uses as much as digits as its factorization.

205125516425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8205020667 (or 8205020662 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 205125516425 in words is "two hundred five billion, one hundred twenty-five million, five hundred sixteen thousand, four hundred twenty-five".