1216552805745 has 32 divisors (see below), whose sum is σ = 2056001654784. Its totient is φ = 613295928000.

The previous prime is 1216552805737. The next prime is 1216552805771. The reversal of 1216552805745 is 5475082556121.

It is not a de Polignac number, because 1216552805745 - 2³ = 1216552805737 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 30401431 + ... + 30441420.

It is an arithmetic number, because the mean of its divisors is an integer number (64250051712).

Almost surely, 2^{1216552805745} is an apocalyptic number.

1216552805745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216552805745 is a deficient number, since it is larger than the sum of its proper divisors (839448849039).

1216552805745 is a wasteful number, since it uses less digits than its factorization.

1216552805745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60842933.

The product of its (nonzero) digits is 3360000, while the sum is 51.

The spelling of 1216552805745 in words is "one trillion, two hundred sixteen billion, five hundred fifty-two million, eight hundred five thousand, seven hundred forty-five".