11056566521 has 16 divisors (see below), whose sum is σ = 14845181568. Its totient is φ = 7952774400.

The previous prime is 11056566517. The next prime is 11056566541. The reversal of 11056566521 is 12566565011.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11056566521 - 2² = 11056566517 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11056566541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5521760 + ... + 5523761.

It is an arithmetic number, because the mean of its divisors is an integer number (927823848).

Almost surely, 2^11056566521 is an apocalyptic number.

11056566521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11056566521 is a deficient number, since it is larger than the sum of its proper divisors (3788615047).

11056566521 is a wasteful number, since it uses less digits than its factorization.

11056566521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11045552.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 11056566521 in words is "eleven billion, fifty-six million, five hundred sixty-six thousand, five hundred twenty-one".