11865692161 has 16 divisors (see below), whose sum is σ = 12115778688. Its totient is φ = 11618006400.

The previous prime is 11865692129. The next prime is 11865692221. The reversal of 11865692161 is 16129656811.

It is a cyclic number.

It is not a de Polignac number, because 11865692161 - 2⁵ = 11865692129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11865692101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10855531 + ... + 10856623.

It is an arithmetic number, because the mean of its divisors is an integer number (757236168).

Almost surely, 2^11865692161 is an apocalyptic number.

It is an amenable number.

11865692161 is a deficient number, since it is larger than the sum of its proper divisors (250086527).

11865692161 is a wasteful number, since it uses less digits than its factorization.

11865692161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992.

The product of its digits is 155520, while the sum is 46.

The spelling of 11865692161 in words is "eleven billion, eight hundred sixty-five million, six hundred ninety-two thousand, one hundred sixty-one".