11691538966 has 4 divisors (see below), whose sum is σ = 17537308452. Its totient is φ = 5845769482.

The previous prime is 11691538921. The next prime is 11691538981. The reversal of 11691538966 is 66983519611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66983519611 = 613 ⋅109271647.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2922884740 + ... + 2922884743.

It is an arithmetic number, because the mean of its divisors is an integer number (4384327113).

Almost surely, 2^11691538966 is an apocalyptic number.

11691538966 is a deficient number, since it is larger than the sum of its proper divisors (5845769486).

11691538966 is an equidigital number, since it uses as much as digits as its factorization.

11691538966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5845769485.

The product of its digits is 2099520, while the sum is 55.

The spelling of 11691538966 in words is "eleven billion, six hundred ninety-one million, five hundred thirty-eight thousand, nine hundred sixty-six".