205424441555 has 4 divisors (see below), whose sum is σ = 246509329872. Its totient is φ = 164339553240.

The previous prime is 205424441539. The next prime is 205424441569. The reversal of 205424441555 is 555144424502.

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

It is not a de Polignac number, because 205424441555 - 2⁴ = 205424441539 is a prime.

It is a super-2 number, since 2×205424441555² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20542444151 + ... + 20542444160.

It is an arithmetic number, because the mean of its divisors is an integer number (61627332468).

Almost surely, 2^205424441555 is an apocalyptic number.

205424441555 is a deficient number, since it is larger than the sum of its proper divisors (41084888317).

205424441555 is an equidigital number, since it uses as much as digits as its factorization.

205424441555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41084888316.

The product of its (nonzero) digits is 640000, while the sum is 41.

The spelling of 205424441555 in words is "two hundred five billion, four hundred twenty-four million, four hundred forty-one thousand, five hundred fifty-five".