11981112257 has 8 divisors (see below), whose sum is σ = 12189693600. Its totient is φ = 11773406304.

The previous prime is 11981112251. The next prime is 11981112281. The reversal of 11981112257 is 75221118911.

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

It is a cyclic number.

It is not a de Polignac number, because 11981112257 - 2³⁰ = 10907370433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11981112257.

It is not an unprimeable number, because it can be changed into a prime (11981112251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191207 + ... + 246012.

It is an arithmetic number, because the mean of its divisors is an integer number (1523711700).

Almost surely, 2^11981112257 is an apocalyptic number.

It is an amenable number.

11981112257 is a deficient number, since it is larger than the sum of its proper divisors (208581343).

11981112257 is an equidigital number, since it uses as much as digits as its factorization.

11981112257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437695.

The product of its digits is 10080, while the sum is 38.

The spelling of 11981112257 in words is "eleven billion, nine hundred eighty-one million, one hundred twelve thousand, two hundred fifty-seven".