1216544463 has 24 divisors (see below), whose sum is σ = 1884168000. Its totient is φ = 753652224.

The previous prime is 1216544447. The next prime is 1216544467. The reversal of 1216544463 is 3644456121.

It is not a de Polignac number, because 1216544463 - 2⁴ = 1216544447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216544467) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 38238 + ... + 62411.

It is an arithmetic number, because the mean of its divisors is an integer number (78507000).

Almost surely, 2^1216544463 is an apocalyptic number.

1216544463 is a deficient number, since it is larger than the sum of its proper divisors (667623537).

1216544463 is a wasteful number, since it uses less digits than its factorization.

1216544463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100751 (or 100748 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 1216544463 is about 34878.9974483212. The cubic root of 1216544463 is about 1067.5199390046.

The spelling of 1216544463 in words is "one billion, two hundred sixteen million, five hundred forty-four thousand, four hundred sixty-three".