11156010561 has 6 divisors (see below), whose sum is σ = 16114237490. Its totient is φ = 7437340368.

The previous prime is 11156010557. The next prime is 11156010571. The reversal of 11156010561 is 16501065111.

11156010561 is a `hidden beast` number, since 1 + 1 + 1 + 5 + 601 + 0 + 56 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9432100161 + 1723910400 = 97119^2 + 41520^2 .

It is not a de Polignac number, because 11156010561 - 2² = 11156010557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11156010511) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 619778356 + ... + 619778373.

Almost surely, 2^11156010561 is an apocalyptic number.

It is an amenable number.

11156010561 is a deficient number, since it is larger than the sum of its proper divisors (4958226929).

11156010561 is a wasteful number, since it uses less digits than its factorization.

11156010561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1239556735 (or 1239556732 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

Adding to 11156010561 its reverse (16501065111), we get a palindrome (27657075672).

It can be divided in two parts, 11 and 156010561, that multiplied together give a palindrome (1716116171).

The spelling of 11156010561 in words is "eleven billion, one hundred fifty-six million, ten thousand, five hundred sixty-one".