1216753865075 has 24 divisors (see below), whose sum is σ = 1724367609600. Its totient is φ = 834319591200.

The previous prime is 1216753865023. The next prime is 1216753865077. The reversal of 1216753865075 is 5705683576121.

It is a de Polignac number, because none of the positive numbers 2^k-1216753865075 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216753865075.

It is not an unprimeable number, because it can be changed into a prime (1216753865077) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6801626 + ... + 6978224.

It is an arithmetic number, because the mean of its divisors is an integer number (71848650400).

Almost surely, 2^{1216753865075} is an apocalyptic number.

1216753865075 is a deficient number, since it is larger than the sum of its proper divisors (507613744525).

1216753865075 is a wasteful number, since it uses less digits than its factorization.

1216753865075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215987 (or 215982 counting only the distinct ones).

The product of its (nonzero) digits is 10584000, while the sum is 56.

The spelling of 1216753865075 in words is "one trillion, two hundred sixteen billion, seven hundred fifty-three million, eight hundred sixty-five thousand, seventy-five".