1166065616661 has 16 divisors (see below), whose sum is σ = 1696689242688. Its totient is φ = 706459017600.

The previous prime is 1166065616603. The next prime is 1166065616687. The reversal of 1166065616661 is 1666165606611.

It is not a de Polignac number, because 1166065616661 - 2²⁶ = 1165998507797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166065616861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6089710 + ... + 6278271.

It is an arithmetic number, because the mean of its divisors is an integer number (106043077668).

Almost surely, 2^{1166065616661} is an apocalyptic number.

1166065616661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1166065616661 is a deficient number, since it is larger than the sum of its proper divisors (530623626027).

1166065616661 is a wasteful number, since it uses less digits than its factorization.

1166065616661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12370852.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 1166065616661 in words is "one trillion, one hundred sixty-six billion, sixty-five million, six hundred sixteen thousand, six hundred sixty-one".