305666344226221 has 6 divisors (see below), whose sum is σ = 335980361835566. Its totient is φ = 277878494751000.

The previous prime is 305666344226207. The next prime is 305666344226231. The reversal of 305666344226221 is 122622443666503.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 168701781675625 + 136964562550596 = 12988525^2 + 11703186^2 .

It is not a de Polignac number, because 305666344226221 - 2²¹ = 305666342129069 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 (305666344226231) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1263084066930 + ... + 1263084067171.

Almost surely, 2^{305666344226221} is an apocalyptic number.

It is an amenable number.

305666344226221 is a deficient number, since it is larger than the sum of its proper divisors (30314017609345).

305666344226221 is a wasteful number, since it uses less digits than its factorization.

305666344226221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2526168134123 (or 2526168134112 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 52.

The spelling of 305666344226221 in words is "three hundred five trillion, six hundred sixty-six billion, three hundred forty-four million, two hundred twenty-six thousand, two hundred twenty-one".