205545401345 has 4 divisors (see below), whose sum is σ = 246654481620. Its totient is φ = 164436321072.

The previous prime is 205545401293. The next prime is 205545401353. The reversal of 205545401345 is 543104545502.

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

It can be written as a sum of positive squares in 2 ways, for example, as 127180677376 + 78364723969 = 356624^2 + 279937^2 .

It is a cyclic number.

It is not a de Polignac number, because 205545401345 - 2²⁸ = 205276965889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205545401299 and 205545401308.

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, 20554540130 + ... + 20554540139.

It is an arithmetic number, because the mean of its divisors is an integer number (61663620405).

Almost surely, 2^205545401345 is an apocalyptic number.

It is an amenable number.

205545401345 is a deficient number, since it is larger than the sum of its proper divisors (41109080275).

205545401345 is an equidigital number, since it uses as much as digits as its factorization.

205545401345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41109080274.

The product of its (nonzero) digits is 240000, while the sum is 38.

Adding to 205545401345 its reverse (543104545502), we get a palindrome (748649946847).

The spelling of 205545401345 in words is "two hundred five billion, five hundred forty-five million, four hundred one thousand, three hundred forty-five".