1216526614489 has 2 divisors, whose sum is σ = 1216526614490. Its totient is φ = 1216526614488.

The previous prime is 1216526614447. The next prime is 1216526614517. The reversal of 1216526614489 is 9844166256121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 848071544464 + 368455070025 = 920908^2 + 607005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216526614489 - 2¹⁹ = 1216526090201 is a prime.

It is a super-2 number, since 2×1216526614489² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1216526614889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608263307244 + 608263307245.

It is an arithmetic number, because the mean of its divisors is an integer number (608263307245).

Almost surely, 2^{1216526614489} is an apocalyptic number.

It is an amenable number.

1216526614489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216526614489 is an equidigital number, since it uses as much as digits as its factorization.

1216526614489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4976640, while the sum is 55.

The spelling of 1216526614489 in words is "one trillion, two hundred sixteen billion, five hundred twenty-six million, six hundred fourteen thousand, four hundred eighty-nine".