11621520563605 has 4 divisors (see below), whose sum is σ = 13945824676332. Its totient is φ = 9297216450880.

The previous prime is 11621520563581. The next prime is 11621520563617. The reversal of 11621520563605 is 50636502512611.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1666593213156 + 9954927350449 = 1290966^2 + 3155143^2 .

It is not a de Polignac number, because 11621520563605 - 2¹¹ = 11621520561557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1162152056356 + ... + 1162152056365.

It is an arithmetic number, because the mean of its divisors is an integer number (3486456169083).

Almost surely, 2^{11621520563605} is an apocalyptic number.

It is an amenable number.

11621520563605 is a deficient number, since it is larger than the sum of its proper divisors (2324304112727).

11621520563605 is an equidigital number, since it uses as much as digits as its factorization.

11621520563605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324304112726.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 11621520563605 in words is "eleven trillion, six hundred twenty-one billion, five hundred twenty million, five hundred sixty-three thousand, six hundred five".