11556272257 has 4 divisors (see below), whose sum is σ = 12236052996. Its totient is φ = 10876491520.

The previous prime is 11556272243. The next prime is 11556272281. The reversal of 11556272257 is 75227265511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7212935041 + 4343337216 = 84929^2 + 65904^2 .

It is a cyclic number.

It is not a de Polignac number, because 11556272257 - 2¹⁹ = 11555747969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11556272297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 339890344 + ... + 339890377.

It is an arithmetic number, because the mean of its divisors is an integer number (3059013249).

Almost surely, 2^11556272257 is an apocalyptic number.

11556272257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11556272257 is a deficient number, since it is larger than the sum of its proper divisors (679780739).

11556272257 is an equidigital number, since it uses as much as digits as its factorization.

11556272257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 679780738.

The product of its digits is 294000, while the sum is 43.

The spelling of 11556272257 in words is "eleven billion, five hundred fifty-six million, two hundred seventy-two thousand, two hundred fifty-seven".