224561601553721 has 4 divisors (see below), whose sum is σ = 224561632144932. Its totient is φ = 224561570962512.

The previous prime is 224561601553711. The next prime is 224561601553727. The reversal of 224561601553721 is 127355106165422.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 42423337422400 + 182138264131321 = 6513320^2 + 13495861^2 .

It is a cyclic number.

It is not a de Polignac number, because 224561601553721 - 2³⁰ = 224560527811897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 224561601553721.

It is not an unprimeable number, because it can be changed into a prime (224561601553727) 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, 3050375 + ... + 21410931.

It is an arithmetic number, because the mean of its divisors is an integer number (56140408036233).

Almost surely, 2^{224561601553721} is an apocalyptic number.

It is an amenable number.

224561601553721 is a deficient number, since it is larger than the sum of its proper divisors (30591211).

224561601553721 is a wasteful number, since it uses less digits than its factorization.

224561601553721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30591210.

The product of its (nonzero) digits is 3024000, while the sum is 50.

The spelling of 224561601553721 in words is "two hundred twenty-four trillion, five hundred sixty-one billion, six hundred one million, five hundred fifty-three thousand, seven hundred twenty-one".