1216453656828 has 48 divisors (see below), whose sum is σ = 2865120325760. Its totient is φ = 401667989184.

The previous prime is 1216453656797. The next prime is 1216453656829. The reversal of 1216453656828 is 8286563546121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216453656829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5440251 + ... + 5659437.

Almost surely, 2^{1216453656828} is an apocalyptic number.

It is an amenable number.

1216453656828 is an abundant number, since it is smaller than the sum of its proper divisors (1648666668932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216453656828 is a wasteful number, since it uses less digits than its factorization.

1216453656828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223546 (or 223544 counting only the distinct ones).

The product of its digits is 16588800, while the sum is 57.

The spelling of 1216453656828 in words is "one trillion, two hundred sixteen billion, four hundred fifty-three million, six hundred fifty-six thousand, eight hundred twenty-eight".