11656606061 has 4 divisors (see below), whose sum is σ = 11656823292. Its totient is φ = 11656388832.

The previous prime is 11656606051. The next prime is 11656606067. The reversal of 11656606061 is 16060665611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16060665611 = 88997 ⋅180463.

It can be written as a sum of positive squares in 2 ways, for example, as 11635721161 + 20884900 = 107869^2 + 4570^2 .

It is a cyclic number.

It is not a de Polignac number, because 11656606061 - 2¹⁴ = 11656589677 is a prime.

It is a super-2 number, since 2×11656606061² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11656606067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36521 + ... + 156993.

It is an arithmetic number, because the mean of its divisors is an integer number (2914205823).

Almost surely, 2^11656606061 is an apocalyptic number.

It is an amenable number.

11656606061 is a deficient number, since it is larger than the sum of its proper divisors (217231).

11656606061 is an equidigital number, since it uses as much as digits as its factorization.

11656606061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217230.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 11656606061 in words is "eleven billion, six hundred fifty-six million, six hundred six thousand, sixty-one".