11911209239857 has 8 divisors (see below), whose sum is σ = 11931903799200. Its totient is φ = 11890516052064.

The previous prime is 11911209239821. The next prime is 11911209239879. The reversal of 11911209239857 is 75893290211911.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11911209239857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11911209239057) 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, 17881069 + ... + 18535237.

It is an arithmetic number, because the mean of its divisors is an integer number (1491487974900).

Almost surely, 2^{11911209239857} is an apocalyptic number.

It is an amenable number.

11911209239857 is a deficient number, since it is larger than the sum of its proper divisors (20694559343).

11911209239857 is an equidigital number, since it uses as much as digits as its factorization.

11911209239857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685775.

The product of its (nonzero) digits is 2449440, while the sum is 58.

The spelling of 11911209239857 in words is "eleven trillion, nine hundred eleven billion, two hundred nine million, two hundred thirty-nine thousand, eight hundred fifty-seven".