1216531634548 has 12 divisors (see below), whose sum is σ = 2128938930720. Its totient is φ = 608263368632.

The previous prime is 1216531634533. The next prime is 1216531634587. The reversal of 1216531634548 is 8454361356121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 946815 + ... + 1824697.

It is an arithmetic number, because the mean of its divisors is an integer number (177411577560).

Almost surely, 2^{1216531634548} is an apocalyptic number.

It is an amenable number.

1216531634548 is a deficient number, since it is larger than the sum of its proper divisors (912407296172).

1216531634548 is a wasteful number, since it uses less digits than its factorization.

1216531634548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224326 (or 1224324 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 49.

The spelling of 1216531634548 in words is "one trillion, two hundred sixteen billion, five hundred thirty-one million, six hundred thirty-four thousand, five hundred forty-eight".