1665511116066 has 24 divisors (see below), whose sum is σ = 4124122763904. Its totient is φ = 475860318840.

The previous prime is 1665511116047. The next prime is 1665511116119. The reversal of 1665511116066 is 6606111155661.

1665511116066 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 511 + 11 + 60 + 66 = 666.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 6609170970 + ... + 6609171221.

It is an arithmetic number, because the mean of its divisors is an integer number (171838448496).

Almost surely, 2^{1665511116066} is an apocalyptic number.

1665511116066 is an abundant number, since it is smaller than the sum of its proper divisors (2458611647838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665511116066 is a wasteful number, since it uses less digits than its factorization.

1665511116066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13218342206 (or 13218342203 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 1665511116066 in words is "one trillion, six hundred sixty-five billion, five hundred eleven million, one hundred sixteen thousand, sixty-six".