11172206557 has 4 divisors (see below), whose sum is σ = 11829395196. Its totient is φ = 10515017920.

The previous prime is 11172206543. The next prime is 11172206569. The reversal of 11172206557 is 75560227111.

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 3965724676 + 7206481881 = 62974^2 + 84891^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11172206557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11172206257) 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, 328594294 + ... + 328594327.

It is an arithmetic number, because the mean of its divisors is an integer number (2957348799).

Almost surely, 2^11172206557 is an apocalyptic number.

11172206557 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

11172206557 is a deficient number, since it is larger than the sum of its proper divisors (657188639).

11172206557 is an equidigital number, since it uses as much as digits as its factorization.

11172206557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657188638.

The product of its (nonzero) digits is 29400, while the sum is 37.

The spelling of 11172206557 in words is "eleven billion, one hundred seventy-two million, two hundred six thousand, five hundred fifty-seven".