1216427587659 has 10 divisors (see below), whose sum is σ = 1817132569340. Its totient is φ = 810951725052.

The previous prime is 1216427587649. The next prime is 1216427587709. The reversal of 1216427587659 is 9567857246121.

It is a happy number.

1216427587659 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 42 + 7 + 587 + 6 + 5 + 9 = 666.

It is not a de Polignac number, because 1216427587659 - 2⁹ = 1216427587147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1216427587596 and 1216427587605.

It is not an unprimeable number, because it can be changed into a prime (1216427587649) 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 9 ways as a sum of consecutive naturals, for example, 7508812189 + ... + 7508812350.

It is an arithmetic number, because the mean of its divisors is an integer number (181713256934).

Almost surely, 2^{1216427587659} is an apocalyptic number.

1216427587659 is a deficient number, since it is larger than the sum of its proper divisors (600704981681).

1216427587659 is an equidigital number, since it uses as much as digits as its factorization.

1216427587659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15017624551 (or 15017624542 counting only the distinct ones).

The product of its digits is 50803200, while the sum is 63.

The spelling of 1216427587659 in words is "one trillion, two hundred sixteen billion, four hundred twenty-seven million, five hundred eighty-seven thousand, six hundred fifty-nine".