11665391742 has 20 divisors (see below), whose sum is σ = 26139118896. Its totient is φ = 3888463860.

The previous prime is 11665391737. The next prime is 11665391797. The reversal of 11665391742 is 24719356611.

11665391742 is a `hidden beast` number, since 1 + 1 + 66 + 539 + 17 + 42 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 36004134 + ... + 36004457.

Almost surely, 2^11665391742 is an apocalyptic number.

11665391742 is an abundant number, since it is smaller than the sum of its proper divisors (14473727154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11665391742 is an equidigital number, since it uses as much as digits as its factorization.

11665391742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72008605 (or 72008596 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The spelling of 11665391742 in words is "eleven billion, six hundred sixty-five million, three hundred ninety-one thousand, seven hundred forty-two".