11916631585 has 4 divisors (see below), whose sum is σ = 14299957908. Its totient is φ = 9533305264.

The previous prime is 11916631583. The next prime is 11916631589. The reversal of 11916631585 is 58513661911.

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 9144714384 + 2771917201 = 95628^2 + 52649^2 .

It is a cyclic number.

It is not a de Polignac number, because 11916631585 - 2¹ = 11916631583 is a prime.

It is a super-2 number, since 2×11916631585² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11916631583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1191663154 + ... + 1191663163.

It is an arithmetic number, because the mean of its divisors is an integer number (3574989477).

Almost surely, 2^11916631585 is an apocalyptic number.

It is an amenable number.

11916631585 is a deficient number, since it is larger than the sum of its proper divisors (2383326323).

11916631585 is an equidigital number, since it uses as much as digits as its factorization.

11916631585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2383326322.

The product of its digits is 194400, while the sum is 46.

The spelling of 11916631585 in words is "eleven billion, nine hundred sixteen million, six hundred thirty-one thousand, five hundred eighty-five".