11557755049 has 3 divisors (see below), whose sum is σ = 11557862557. Its totient is φ = 11557647542.

The previous prime is 11557755037. The next prime is 11557755089. The reversal of 11557755049 is 94055775511.

The square root of 11557755049 is 107507.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94055775511 = 47 ⋅2001186713.

It is not a de Polignac number, because 11557755049 - 2¹⁷ = 11557623977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11557754993 and 11557755011.

It is not an unprimeable number, because it can be changed into a prime (11557755089) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 53754 + ... + 161260.

Almost surely, 2^11557755049 is an apocalyptic number.

11557755049 is the 107507-th square number.

11557755049 is the 53754-th centered octagonal number.

It is an amenable number.

11557755049 is a deficient number, since it is larger than the sum of its proper divisors (107508).

11557755049 is an frugal number, since it uses more digits than its factorization.

11557755049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215014 (or 107507 counting only the distinct ones).

The product of its (nonzero) digits is 1102500, while the sum is 49.

Multiplying 11557755049 by its sum of digits (49), we get a square (566329997401 = 752549²).

The spelling of 11557755049 in words is "eleven billion, five hundred fifty-seven million, seven hundred fifty-five thousand, forty-nine".