205906810315 has 4 divisors (see below), whose sum is σ = 247088172384. Its totient is φ = 164725448248.

The previous prime is 205906810313. The next prime is 205906810327. The reversal of 205906810315 is 513018609502.

205906810315 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 205906810315 - 2¹ = 205906810313 is a prime.

It is a super-2 number, since 2×205906810315² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205906810313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20590681027 + ... + 20590681036.

It is an arithmetic number, because the mean of its divisors is an integer number (61772043096).

Almost surely, 2^205906810315 is an apocalyptic number.

205906810315 is a deficient number, since it is larger than the sum of its proper divisors (41181362069).

205906810315 is an equidigital number, since it uses as much as digits as its factorization.

205906810315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41181362068.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 205906810315 in words is "two hundred five billion, nine hundred six million, eight hundred ten thousand, three hundred fifteen".