205113454401 has 4 divisors (see below), whose sum is σ = 273484605872. Its totient is φ = 136742302932.

The previous prime is 205113454387. The next prime is 205113454451. The reversal of 205113454401 is 104454311502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 205113454401 - 2¹¹ = 205113452353 is a prime.

It is a super-2 number, since 2×205113454401² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205113454451) 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, 34185575731 + ... + 34185575736.

It is an arithmetic number, because the mean of its divisors is an integer number (68371151468).

Almost surely, 2^205113454401 is an apocalyptic number.

It is an amenable number.

205113454401 is a deficient number, since it is larger than the sum of its proper divisors (68371151471).

205113454401 is an equidigital number, since it uses as much as digits as its factorization.

205113454401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68371151470.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 205113454401 its reverse (104454311502), we get a palindrome (309567765903).

The spelling of 205113454401 in words is "two hundred five billion, one hundred thirteen million, four hundred fifty-four thousand, four hundred one".