11856869691 has 32 divisors (see below), whose sum is σ = 16877979648. Its totient is φ = 7378076160.

The previous prime is 11856869683. The next prime is 11856869699. The reversal of 11856869691 is 19696865811.

It is an interprime number because it is at equal distance from previous prime (11856869683) and next prime (11856869699).

It is not a de Polignac number, because 11856869691 - 2³ = 11856869683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11856869699) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 5531766 + ... + 5533908.

It is an arithmetic number, because the mean of its divisors is an integer number (527436864).

Almost surely, 2^11856869691 is an apocalyptic number.

11856869691 is a deficient number, since it is larger than the sum of its proper divisors (5021109957).

11856869691 is a wasteful number, since it uses less digits than its factorization.

11856869691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011.

The product of its digits is 5598720, while the sum is 60.

The spelling of 11856869691 in words is "eleven billion, eight hundred fifty-six million, eight hundred sixty-nine thousand, six hundred ninety-one".