12216303557 has 2 divisors, whose sum is σ = 12216303558. Its totient is φ = 12216303556.

The previous prime is 12216303551. The next prime is 12216303577. The reversal of 12216303557 is 75530361221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11400687076 + 815616481 = 106774^2 + 28559^2 .

It is a cyclic number.

It is not a de Polignac number, because 12216303557 - 2¹⁰ = 12216302533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12216303551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6108151778 + 6108151779.

It is an arithmetic number, because the mean of its divisors is an integer number (6108151779).

Almost surely, 2^12216303557 is an apocalyptic number.

It is an amenable number.

12216303557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12216303557 is an equidigital number, since it uses as much as digits as its factorization.

12216303557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 35.

Adding to 12216303557 its reverse (75530361221), we get a palindrome (87746664778).

The spelling of 12216303557 in words is "twelve billion, two hundred sixteen million, three hundred three thousand, five hundred fifty-seven".