11580558985 has 4 divisors (see below), whose sum is σ = 13896670788. Its totient is φ = 9264447184.

The previous prime is 11580558971. The next prime is 11580559021. The reversal of 11580558985 is 58985508511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58985508511 = 8719 ⋅6765169.

It can be written as a sum of positive squares in 2 ways, for example, as 7148195209 + 4432363776 = 84547^2 + 66576^2 .

It is a cyclic number.

It is not a de Polignac number, because 11580558985 - 2¹¹ = 11580556937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1158055894 + ... + 1158055903.

It is an arithmetic number, because the mean of its divisors is an integer number (3474167697).

Almost surely, 2^11580558985 is an apocalyptic number.

It is an amenable number.

11580558985 is a deficient number, since it is larger than the sum of its proper divisors (2316111803).

11580558985 is an equidigital number, since it uses as much as digits as its factorization.

11580558985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316111802.

The product of its (nonzero) digits is 2880000, while the sum is 55.

The spelling of 11580558985 in words is "eleven billion, five hundred eighty million, five hundred fifty-eight thousand, nine hundred eighty-five".