616420335221 has 2 divisors, whose sum is σ = 616420335222. Its totient is φ = 616420335220.

The previous prime is 616420335199. The next prime is 616420335277. The reversal of 616420335221 is 122533024616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 594148056100 + 22272279121 = 770810^2 + 149239^2 .

It is a cyclic number.

It is not a de Polignac number, because 616420335221 - 2¹⁴ = 616420318837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616420385221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308210167610 + 308210167611.

It is an arithmetic number, because the mean of its divisors is an integer number (308210167611).

Almost surely, 2^616420335221 is an apocalyptic number.

It is an amenable number.

616420335221 is a deficient number, since it is larger than the sum of its proper divisors (1).

616420335221 is an equidigital number, since it uses as much as digits as its factorization.

616420335221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 616420335221 its reverse (122533024616), we get a palindrome (738953359837).

The spelling of 616420335221 in words is "six hundred sixteen billion, four hundred twenty million, three hundred thirty-five thousand, two hundred twenty-one".