11199720557 has 4 divisors (see below), whose sum is σ = 11223703296. Its totient is φ = 11175737820.

The previous prime is 11199720541. The next prime is 11199720577. The reversal of 11199720557 is 75502799111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11199720557 - 2⁴ = 11199720541 is a prime.

It is a super-3 number, since 3×11199720557³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11199720527) 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, 11990669 + ... + 11991602.

It is an arithmetic number, because the mean of its divisors is an integer number (2805925824).

Almost surely, 2^11199720557 is an apocalyptic number.

It is an amenable number.

11199720557 is a deficient number, since it is larger than the sum of its proper divisors (23982739).

11199720557 is an equidigital number, since it uses as much as digits as its factorization.

11199720557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23982738.

The product of its (nonzero) digits is 198450, while the sum is 47.

The spelling of 11199720557 in words is "eleven billion, one hundred ninety-nine million, seven hundred twenty thousand, five hundred fifty-seven".