11897766689 has 4 divisors (see below), whose sum is σ = 11901047040. Its totient is φ = 11894486340.

The previous prime is 11897766607. The next prime is 11897766691. The reversal of 11897766689 is 98666779811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98666779811 = 173 ⋅570328207.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11897766689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11897766889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1634729 + ... + 1641990.

It is an arithmetic number, because the mean of its divisors is an integer number (2975261760).

Almost surely, 2^11897766689 is an apocalyptic number.

It is an amenable number.

11897766689 is a deficient number, since it is larger than the sum of its proper divisors (3280351).

11897766689 is an equidigital number, since it uses as much as digits as its factorization.

11897766689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280350.

The product of its digits is 54867456, while the sum is 68.

The spelling of 11897766689 in words is "eleven billion, eight hundred ninety-seven million, seven hundred sixty-six thousand, six hundred eighty-nine".