205616171493 has 40 divisors (see below), whose sum is σ = 318437957376. Its totient is φ = 132122664000.

The previous prime is 205616171491. The next prime is 205616171549. The reversal of 205616171493 is 394171616502.

205616171493 is a `hidden beast` number, since 2 + 0 + 5 + 616 + 17 + 14 + 9 + 3 = 666.

It is not a de Polignac number, because 205616171493 - 2¹ = 205616171491 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205616171491) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 97333 + ... + 648618.

Almost surely, 2^205616171493 is an apocalyptic number.

It is an amenable number.

205616171493 is a deficient number, since it is larger than the sum of its proper divisors (112821785883).

205616171493 is an equidigital number, since it uses as much as digits as its factorization.

205616171493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746087 (or 746078 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

Adding to 205616171493 its reverse (394171616502), we get a palindrome (599787787995).

The spelling of 205616171493 in words is "two hundred five billion, six hundred sixteen million, one hundred seventy-one thousand, four hundred ninety-three".