1056661116209 has 8 divisors (see below), whose sum is σ = 1057395572640. Its totient is φ = 1055926767456.

The previous prime is 1056661116197. The next prime is 1056661116211. The reversal of 1056661116209 is 9026111666501.

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 1056661116209 - 2¹⁶ = 1056661050673 is a prime.

It is a super-2 number, since 2×1056661116209² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1056661116209.

It is not an unprimeable number, because it can be changed into a prime (1056661116109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33244877 + ... + 33276645.

It is an arithmetic number, because the mean of its divisors is an integer number (132174446580).

Almost surely, 2^{1056661116209} is an apocalyptic number.

It is an amenable number.

1056661116209 is a deficient number, since it is larger than the sum of its proper divisors (734456431).

1056661116209 is a wasteful number, since it uses less digits than its factorization.

1056661116209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53839.

The product of its (nonzero) digits is 116640, while the sum is 44.

The spelling of 1056661116209 in words is "one trillion, fifty-six billion, six hundred sixty-one million, one hundred sixteen thousand, two hundred nine".