11965689577 has 4 divisors (see below), whose sum is σ = 12026429316. Its totient is φ = 11904949840.

The previous prime is 11965689563. The next prime is 11965689587. The reversal of 11965689577 is 77598656911.

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 5271340816 + 6694348761 = 72604^2 + 81819^2 .

It is a cyclic number.

It is not a de Polignac number, because 11965689577 - 2²³ = 11957300969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11965689517) 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, 30369574 + ... + 30369967.

It is an arithmetic number, because the mean of its divisors is an integer number (3006607329).

Almost surely, 2^11965689577 is an apocalyptic number.

It is an amenable number.

11965689577 is a deficient number, since it is larger than the sum of its proper divisors (60739739).

11965689577 is an equidigital number, since it uses as much as digits as its factorization.

11965689577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60739738.

The product of its digits is 28576800, while the sum is 64.

The spelling of 11965689577 in words is "eleven billion, nine hundred sixty-five million, six hundred eighty-nine thousand, five hundred seventy-seven".