11661165011 has 8 divisors (see below), whose sum is σ = 12348591264. Its totient is φ = 10973902720.

The previous prime is 11661164989. The next prime is 11661165067. The reversal of 11661165011 is 11056116611.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11661165011 - 2²⁶ = 11594056147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11661135011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124586 + ... + 197088.

It is an arithmetic number, because the mean of its divisors is an integer number (1543573908).

Almost surely, 2^11661165011 is an apocalyptic number.

11661165011 is a deficient number, since it is larger than the sum of its proper divisors (687426253).

11661165011 is an equidigital number, since it uses as much as digits as its factorization.

11661165011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81981.

The product of its (nonzero) digits is 1080, while the sum is 29.

The spelling of 11661165011 in words is "eleven billion, six hundred sixty-one million, one hundred sixty-five thousand, eleven".