1966660811211 has 8 divisors (see below), whose sum is σ = 2641354666704. Its totient is φ = 1301537081600.

The previous prime is 1966660811111. The next prime is 1966660811257. The reversal of 1966660811211 is 1121180666691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1966660811211 - 2¹⁴ = 1966660794827 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1966660811111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2392530990 + ... + 2392531811.

It is an arithmetic number, because the mean of its divisors is an integer number (330169333338).

Almost surely, 2^{1966660811211} is an apocalyptic number.

1966660811211 is a deficient number, since it is larger than the sum of its proper divisors (674693855493).

1966660811211 is a wasteful number, since it uses less digits than its factorization.

1966660811211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4785062941.

The product of its (nonzero) digits is 186624, while the sum is 48.

The spelling of 1966660811211 in words is "one trillion, nine hundred sixty-six billion, six hundred sixty million, eight hundred eleven thousand, two hundred eleven".