11666004121 has 2 divisors, whose sum is σ = 11666004122. Its totient is φ = 11666004120.

The previous prime is 11666004083. The next prime is 11666004127. The reversal of 11666004121 is 12140066611.

11666004121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6231365721 + 5434638400 = 78939^2 + 73720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11666004121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11666004121.

It is not a weakly prime, because it can be changed into another prime (11666004127) 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 as a sum of consecutive naturals, namely, 5833002060 + 5833002061.

It is an arithmetic number, because the mean of its divisors is an integer number (5833002061).

Almost surely, 2^11666004121 is an apocalyptic number.

It is an amenable number.

11666004121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11666004121 is an equidigital number, since it uses as much as digits as its factorization.

11666004121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 11666004121 in words is "eleven billion, six hundred sixty-six million, four thousand, one hundred twenty-one".