654653216221 has 8 divisors (see below), whose sum is σ = 663644958584. Its totient is φ = 645662119680.

The previous prime is 654653216219. The next prime is 654653216237. The reversal of 654653216221 is 122612356456.

It can be written as a sum of positive squares in 4 ways, for example, as 36677995225 + 617975220996 = 191515^2 + 786114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 654653216221 - 2¹ = 654653216219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654653516221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2094811 + ... + 2386951.

It is an arithmetic number, because the mean of its divisors is an integer number (82955619823).

Almost surely, 2^654653216221 is an apocalyptic number.

It is an amenable number.

654653216221 is a deficient number, since it is larger than the sum of its proper divisors (8991742363).

654653216221 is a wasteful number, since it uses less digits than its factorization.

654653216221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322911.

The product of its digits is 518400, while the sum is 43.

The spelling of 654653216221 in words is "six hundred fifty-four billion, six hundred fifty-three million, two hundred sixteen thousand, two hundred twenty-one".