11591811986 has 16 divisors (see below), whose sum is σ = 17484213528. Its totient is φ = 5763763200.

The previous prime is 11591811983. The next prime is 11591812003. The reversal of 11591811986 is 68911819511.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7879225225 + 3712586761 = 88765^2 + 60931^2 .

It is not an unprimeable number, because it can be changed into a prime (11591811983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1935116 + ... + 1941096.

Almost surely, 2^11591811986 is an apocalyptic number.

11591811986 is a deficient number, since it is larger than the sum of its proper divisors (5892401542).

11591811986 is a wasteful number, since it uses less digits than its factorization.

11591811986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11197.

The product of its digits is 155520, while the sum is 50.

The spelling of 11591811986 in words is "eleven billion, five hundred ninety-one million, eight hundred eleven thousand, nine hundred eighty-six".