11591817857 has 2 divisors, whose sum is σ = 11591817858. Its totient is φ = 11591817856.

The previous prime is 11591817841. The next prime is 11591817889. The reversal of 11591817857 is 75871819511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6304201201 + 5287616656 = 79399^2 + 72716^2 .

It is a cyclic number.

It is not a de Polignac number, because 11591817857 - 2⁴ = 11591817841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11591817799 and 11591817808.

It is not a weakly prime, because it can be changed into another prime (11591816857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5795908928 + 5795908929.

It is an arithmetic number, because the mean of its divisors is an integer number (5795908929).

Almost surely, 2^11591817857 is an apocalyptic number.

It is an amenable number.

11591817857 is a deficient number, since it is larger than the sum of its proper divisors (1).

11591817857 is an equidigital number, since it uses as much as digits as its factorization.

11591817857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 53.

The spelling of 11591817857 in words is "eleven billion, five hundred ninety-one million, eight hundred seventeen thousand, eight hundred fifty-seven".