11051071561 has 4 divisors (see below), whose sum is σ = 11701134612. Its totient is φ = 10401008512.

The previous prime is 11051071541. The next prime is 11051071567. The reversal of 11051071561 is 16517015011.

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 9536694336 + 1514377225 = 97656^2 + 38915^2 .

It is a cyclic number.

It is not a de Polignac number, because 11051071561 - 2⁵ = 11051071529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11051071567) 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, 325031500 + ... + 325031533.

It is an arithmetic number, because the mean of its divisors is an integer number (2925283653).

Almost surely, 2^11051071561 is an apocalyptic number.

It is an amenable number.

11051071561 is a deficient number, since it is larger than the sum of its proper divisors (650063051).

11051071561 is an equidigital number, since it uses as much as digits as its factorization.

11051071561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650063050.

The product of its (nonzero) digits is 1050, while the sum is 28.

Adding to 11051071561 its reverse (16517015011), we get a palindrome (27568086572).

The spelling of 11051071561 in words is "eleven billion, fifty-one million, seventy-one thousand, five hundred sixty-one".