205145699 has 16 divisors (see below), whose sum is σ = 228618240. Its totient is φ = 184041000.

The previous prime is 205145663. The next prime is 205145701. The reversal of 205145699 is 996541502.

It is not a de Polignac number, because 205145699 - 2¹² = 205141603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205145609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104174 + ... + 106124.

It is an arithmetic number, because the mean of its divisors is an integer number (14288640).

Almost surely, 2^205145699 is an apocalyptic number.

205145699 is a deficient number, since it is larger than the sum of its proper divisors (23472541).

205145699 is an equidigital number, since it uses as much as digits as its factorization.

205145699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063 (or 2041 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 205145699 is about 14322.9081893308. The cubic root of 205145699 is about 589.7765111601.

The spelling of 205145699 in words is "two hundred five million, one hundred forty-five thousand, six hundred ninety-nine".