11661056520003 has 48 divisors (see below), whose sum is σ = 18842441540832. Its totient is φ = 6887874048000.

The previous prime is 11661056519953. The next prime is 11661056520007. The reversal of 11661056520003 is 30002565016611.

11661056520003 is a `hidden beast` number, since 1 + 1 + 66 + 10 + 565 + 20 + 0 + 0 + 3 = 666.

It is not a de Polignac number, because 11661056520003 - 2⁶ = 11661056519939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11661056520003.

It is not an unprimeable number, because it can be changed into a prime (11661056520007) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2495383 + ... + 5435903.

It is an arithmetic number, because the mean of its divisors is an integer number (392550865434).

Almost surely, 2^{11661056520003} is an apocalyptic number.

11661056520003 is a deficient number, since it is larger than the sum of its proper divisors (7181385020829).

11661056520003 is a wasteful number, since it uses less digits than its factorization.

11661056520003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941556 (or 2941553 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 11661056520003 in words is "eleven trillion, six hundred sixty-one billion, fifty-six million, five hundred twenty thousand, three".