1216425231645 has 64 divisors (see below), whose sum is σ = 2141182874880. Its totient is φ = 586004170752.

The previous prime is 1216425231599. The next prime is 1216425231683. The reversal of 1216425231645 is 5461325246121.

It is not a de Polignac number, because 1216425231645 - 2⁷ = 1216425231517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216425231597 and 1216425231606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3761689 + ... + 4072241.

It is an arithmetic number, because the mean of its divisors is an integer number (33455982420).

Almost surely, 2^{1216425231645} is an apocalyptic number.

1216425231645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216425231645 is a deficient number, since it is larger than the sum of its proper divisors (924757643235).

1216425231645 is a wasteful number, since it uses less digits than its factorization.

1216425231645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311006.

The product of its digits is 345600, while the sum is 42.

The spelling of 1216425231645 in words is "one trillion, two hundred sixteen billion, four hundred twenty-five million, two hundred thirty-one thousand, six hundred forty-five".