11660666657 has 4 divisors (see below), whose sum is σ = 11662957716. Its totient is φ = 11658375600.

The previous prime is 11660666593. The next prime is 11660666663. The reversal of 11660666657 is 75666606611.

11660666657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75666606611 = 313 ⋅241746347.

It can be written as a sum of positive squares in 2 ways, for example, as 48664576 + 11612002081 = 6976^2 + 107759^2 .

It is a cyclic number.

It is not a de Polignac number, because 11660666657 - 2⁶ = 11660666593 is a prime.

It is a super-2 number, since 2×11660666657² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11660666357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1137878 + ... + 1148079.

It is an arithmetic number, because the mean of its divisors is an integer number (2915739429).

Almost surely, 2^11660666657 is an apocalyptic number.

It is an amenable number.

11660666657 is a deficient number, since it is larger than the sum of its proper divisors (2291059).

11660666657 is an equidigital number, since it uses as much as digits as its factorization.

11660666657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2291058.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 11660666657 in words is "eleven billion, six hundred sixty million, six hundred sixty-six thousand, six hundred fifty-seven".