11665042507 has 4 divisors (see below), whose sum is σ = 12351221496. Its totient is φ = 10978863520.

The previous prime is 11665042489. The next prime is 11665042513. The reversal of 11665042507 is 70524056611.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11665042507 - 2⁷ = 11665042379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11665042517) 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, 343089469 + ... + 343089502.

It is an arithmetic number, because the mean of its divisors is an integer number (3087805374).

Almost surely, 2^11665042507 is an apocalyptic number.

11665042507 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

11665042507 is a deficient number, since it is larger than the sum of its proper divisors (686178989).

11665042507 is an equidigital number, since it uses as much as digits as its factorization.

11665042507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686178988.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 11665042507 in words is "eleven billion, six hundred sixty-five million, forty-two thousand, five hundred seven".