11660211661 has 16 divisors (see below), whose sum is σ = 13396206208. Its totient is φ = 9941875200.

The previous prime is 11660211611. The next prime is 11660211677. The reversal of 11660211661 is 16611206611.

11660211661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11660211661 - 2⁷ = 11660211533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11660211601) 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 15 ways as a sum of consecutive naturals, for example, 1739326 + ... + 1746016.

It is an arithmetic number, because the mean of its divisors is an integer number (837262888).

Almost surely, 2^11660211661 is an apocalyptic number.

It is an amenable number.

11660211661 is a deficient number, since it is larger than the sum of its proper divisors (1735994547).

11660211661 is a wasteful number, since it uses less digits than its factorization.

11660211661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7972.

The product of its (nonzero) digits is 2592, while the sum is 31.

The spelling of 11660211661 in words is "eleven billion, six hundred sixty million, two hundred eleven thousand, six hundred sixty-one".