11659868857 has 16 divisors (see below), whose sum is σ = 14463619072. Its totient is φ = 9152740800.

The previous prime is 11659868849. The next prime is 11659868873. The reversal of 11659868857 is 75886895611.

It is a happy number.

It is not a de Polignac number, because 11659868857 - 2³ = 11659868849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11659868807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 492894 + ... + 516007.

It is an arithmetic number, because the mean of its divisors is an integer number (903976192).

Almost surely, 2^11659868857 is an apocalyptic number.

It is an amenable number.

11659868857 is a deficient number, since it is larger than the sum of its proper divisors (2803750215).

11659868857 is a wasteful number, since it uses less digits than its factorization.

11659868857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009048.

The product of its digits is 29030400, while the sum is 64.

The spelling of 11659868857 in words is "eleven billion, six hundred fifty-nine million, eight hundred sixty-eight thousand, eight hundred fifty-seven".