217255646453 has 4 divisors (see below), whose sum is σ = 230035390380. Its totient is φ = 204475902528.

The previous prime is 217255646393. The next prime is 217255646477. The reversal of 217255646453 is 354646552712.

217255646453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 103556527204 + 113699119249 = 321802^2 + 337193^2 .

It is a cyclic number.

It is not a de Polignac number, because 217255646453 - 2⁶ = 217255646389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217255646753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6389871938 + ... + 6389871971.

It is an arithmetic number, because the mean of its divisors is an integer number (57508847595).

Almost surely, 2^217255646453 is an apocalyptic number.

It is an amenable number.

217255646453 is a deficient number, since it is larger than the sum of its proper divisors (12779743927).

217255646453 is a wasteful number, since it uses less digits than its factorization.

217255646453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12779743926.

The product of its digits is 6048000, while the sum is 50.

The spelling of 217255646453 in words is "two hundred seventeen billion, two hundred fifty-five million, six hundred forty-six thousand, four hundred fifty-three".