1216461131563 has 8 divisors (see below), whose sum is σ = 1222260404816. Its totient is φ = 1210662180000.

The previous prime is 1216461131549. The next prime is 1216461131573. The reversal of 1216461131563 is 3651311646121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1216461131563 - 2⁵ = 1216461131531 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216461131573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11368813 + ... + 11475313.

It is an arithmetic number, because the mean of its divisors is an integer number (152782550602).

Almost surely, 2^{1216461131563} is an apocalyptic number.

1216461131563 is a deficient number, since it is larger than the sum of its proper divisors (5799273253).

1216461131563 is a wasteful number, since it uses less digits than its factorization.

1216461131563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160845.

The product of its digits is 77760, while the sum is 40.

Adding to 1216461131563 its reverse (3651311646121), we get a palindrome (4867772777684).

The spelling of 1216461131563 in words is "one trillion, two hundred sixteen billion, four hundred sixty-one million, one hundred thirty-one thousand, five hundred sixty-three".