11561166123653 has 4 divisors (see below), whose sum is σ = 12241234719180. Its totient is φ = 10881097528128.

The previous prime is 11561166123643. The next prime is 11561166123671. The reversal of 11561166123653 is 35632166116511.

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 7717378452289 + 3843787671364 = 2778017^2 + 1960558^2 .

It is a cyclic number.

It is not a de Polignac number, because 11561166123653 - 2³⁰ = 11560092381829 is a prime.

It is a super-3 number, since 3×11561166123653³ (a number of 40 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11561166123598 and 11561166123607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561166123613) 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, 340034297738 + ... + 340034297771.

It is an arithmetic number, because the mean of its divisors is an integer number (3060308679795).

Almost surely, 2^{11561166123653} is an apocalyptic number.

It is an amenable number.

11561166123653 is a deficient number, since it is larger than the sum of its proper divisors (680068595527).

11561166123653 is an equidigital number, since it uses as much as digits as its factorization.

11561166123653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680068595526.

The product of its digits is 583200, while the sum is 47.

The spelling of 11561166123653 in words is "eleven trillion, five hundred sixty-one billion, one hundred sixty-six million, one hundred twenty-three thousand, six hundred fifty-three".