221065453768 has 8 divisors (see below), whose sum is σ = 414497725830. Its totient is φ = 110532726880.

The previous prime is 221065453759. The next prime is 221065453831. The reversal of 221065453768 is 867354560122.

It can be written as a sum of positive squares in only one way, i.e., 165455324644 + 55610129124 = 406762^2 + 235818^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13816590853 + ... + 13816590868.

Almost surely, 2^221065453768 is an apocalyptic number.

It is an amenable number.

221065453768 is a deficient number, since it is larger than the sum of its proper divisors (193432272062).

221065453768 is a wasteful number, since it uses less digits than its factorization.

221065453768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27633181727 (or 27633181723 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 49.

The spelling of 221065453768 in words is "two hundred twenty-one billion, sixty-five million, four hundred fifty-three thousand, seven hundred sixty-eight".