205424043215 has 4 divisors (see below), whose sum is σ = 246508851864. Its totient is φ = 164339234568.

The previous prime is 205424043203. The next prime is 205424043217. The reversal of 205424043215 is 512340424502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 512340424502 = 2 ⋅256170212251.

It is a cyclic number.

It is not a de Polignac number, because 205424043215 - 2¹⁰ = 205424042191 is a prime.

It is a super-3 number, since 3×205424043215³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205424043217) 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, 20542404317 + ... + 20542404326.

It is an arithmetic number, because the mean of its divisors is an integer number (61627212966).

Almost surely, 2^205424043215 is an apocalyptic number.

205424043215 is a deficient number, since it is larger than the sum of its proper divisors (41084808649).

205424043215 is an equidigital number, since it uses as much as digits as its factorization.

205424043215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41084808648.

The product of its (nonzero) digits is 38400, while the sum is 32.

Adding to 205424043215 its reverse (512340424502), we get a palindrome (717764467717).

The spelling of 205424043215 in words is "two hundred five billion, four hundred twenty-four million, forty-three thousand, two hundred fifteen".