11660211601 has 2 divisors, whose sum is σ = 11660211602. Its totient is φ = 11660211600.

The previous prime is 11660211587. The next prime is 11660211611. The reversal of 11660211601 is 10611206611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9964830976 + 1695380625 = 99824^2 + 41175^2 .

It is a cyclic number.

It is not a de Polignac number, because 11660211601 - 2¹⁵ = 11660178833 is a prime.

It is not a weakly prime, because it can be changed into another prime (11660211611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5830105800 + 5830105801.

It is an arithmetic number, because the mean of its divisors is an integer number (5830105801).

Almost surely, 2^11660211601 is an apocalyptic number.

It is an amenable number.

11660211601 is a deficient number, since it is larger than the sum of its proper divisors (1).

11660211601 is an equidigital number, since it uses as much as digits as its factorization.

11660211601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 11660211601 in words is "eleven billion, six hundred sixty million, two hundred eleven thousand, six hundred one".